Concept Check 27.5 Bustamante

Concept check 27.5
1. Explain how muscles work in pairs in moving limbs.

Muscles are connected to bones by tendons. When one muscle contracts, it brings a bone and bends a joint. In order for the bone to go back, another muscle has to contract, thus working in pairs like the biceps and triceps.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.

A muscle fiber is made up of one, multiple nuclei cell. This cell is composed of units called myofibrils. Each myofibril has small units of contraction called sarcomeres. 2 kinds of filaments, actin (thin filaments) and myosin (think filaments), form sarcomeres.
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.

• Nervous system: the brain processes the views you capture, and makes your body and hand muscles respond to it. Also, it processes the stimuli given by the other hand and responds in how much to tighten the hand shake.
• Muscular system: it respond to nervous system by contracting and relaxing many muscles to move your arm and hand.
• Circulatory system: it provides nutrients and oxygen to the nerves and muscles in order for them to function and metabolize properly.

4. Explain how actin and myosin interact as a muscle cell contracts.

Myosin heads attach to the actin. When the heads bend, the overlapping between myosin and actin increases, thus shortening the sarcomere. When the muscle is relaxed, myosin and actin overlap less, lengthening the sarcomere. The various myosin heads detach and attach again, but not simultaneously, so that fibers do not relax.

Concept Check 27.5

1. Explain how muscles work in pairs in moving limbs.
The Muscles of the human body work in pairs. When one muscle relaxes the other one contracts. and viceversa.

2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
Muscle FIbers: They contain the nuclei.
Myofibrils: Contain bandles of smaller units.
Actin: The protain which makes the thinner filaments.
Myosin: The protain which makes the thicker filaments.
Sarcomere: The Muscle fibers.

3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
You use you brain to coordinate you hand with your eye. The you use your nerves to feel the other person's hand. Finally your muscles allow you to move your hands and parts of the body.
4. Explain how actin and myosin interact as a muscle cell contracts.
They are both protains that make the filaments of the muscles.

1. Explain how muscles work in pairs in moving limbs.

For each skeletal muscle that is contracting, there is an opposing muscle—one that is relaxed but that can contract and pull the bone back in the opposite direction.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.

consists of bundles of parallel muscle fibers along with a supply of nerves and blood vessels. Inside a muscle fiber are bundles of smaller units called myofibrils. A single myofibril consists of repeating units called sarcomeres. Each sarcomere is composed of two kinds of filaments, thin and thick. The thin filaments are composed of the protein actin and have a twisted, ropelike structure. The thick filaments are composed of the protein myosin and have bumplike projections called myosin heads.
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.

Involves the cooperation of many of your body's organs, tissues, and cells.

4. Explain how actin and myosin interact as a muscle cell contracts.

In each mini-contraction (shown in Figure 27-18), myosin heads first bind to thin filaments. Next, the myosin heads bend, pulling the thin filaments toward the center of the sarcomere.

Explain how muscles work in pairs in moving limbs.

As one muscle contract the other muscle relaxes. Since muscles cannot push, only pull, and opposing motion is needed to return the bone to its original position.

2. Identify the structures that make up a skeletal muscle. Include these terms:
muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.

Muscle fiber: Long muscle cell that contains many nuclei.
Myofibrils: unit of muscle fiber made up of smaller units that contract (sarcomeres)
Sarcomere: unit of contraction in a muscle fiber Has 2 type of filaments, thin and thick.
Actin. Twisted thin filament in a muscle fiber.
Myosin: The thick filament of a sacromere. Has bump- like projections. called myosin heads.

3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.

First your eyes sense a person near and sends a message to your brain. The thinking part of your brain decides to initiate the handshake. The other regions of the brain sends a message though your nerves to the muscles. The response are coordinated contractions and relaxations in the muscles of the back, shoulder, forearms, upperarm and wrist. These muscles lift and extend the right bones in the correct sequence to extend the hand. At the end many muscles manipulate the 27 bones in your hand into place.

4. Explain how actin and myosin interact as a muscle cell contracts.

Myosin heads with the thin filaments interact to make muscle contraction. IN a mini contraction myosin heads first bind to thin filaments, then the myosin head bend pulling the thin filaments to the center of the sacromere, the ATP binds to each myosin head relicing it from the filament.

CONCEPT CHECK 27.5

1. Explain how muscles work in pairs in moving limbs.
Muscles cannot push only pull, so it works together with a pair. When a muscle is contracting, its opposing muscle is relaxed. This muscle has to contract and pull, so that it moves to the opposite direction. Ex) Biceps and triceps. When Biceps are contracted, triceps are relaxed, And vice verse.

2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
Muscle fiber: Long muscle cell that contains many nuclei. (cylindrical shape)
Myofibrils: Found inside a muscle fiber. Unit of muscle fiber made up of smaller units that contract (sarcomeres)
Sarcomere: A myofibril are repeating units called sarcomeres. Unit of contraction in a muscle fiber. Has 2 type of filaments, thin and thick.
Actin: The thin filament of sacromere. Composed of protein. Twisted thin filament in a muscle fiber.
Myosin: The thick filament of a sacromere. Composed of protein. Has bump- like projections. called myosin heads.

3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
1st. Your eyes see the person, and send a message to your brain. The thinking side initiates the handshake, and sends message to muscles. There are coordinated contraction and relaxation in muscles: your back, shoulder, upper arm, forearm, and wrist. The muscles manipulate the 27 bones in your hand into place.

4. Explain how actin and myosin interact as a muscle cell contracts.
Myosin heads first attach to the thin filaments. Myosin heads bend, and pulls thin fillament in sacromere. ATP releases myosin head from thin filament. Myosin head is now free to attach at a new spot and further pull the thin filament along.

ISA ITURRALDE

1.Explain how muscles work in pairs in moving limbs.

• as one of the muscles contracts the other muscle realxes and this is working in pairs

2.Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.

1. muscles fiber:contain nuclei
2. myofibrils: it contains bandles for smaller units
3. actin:it is the protein that makes up thin filaments
4. Myiosin: protein that makes up thick filaments
5. Saromere: muscles fiber

3.Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.

1. Nerve, Muscle and bone system
2. the nerves feels the other persons hand, after that the muscles relax and contract and finally the bones keep the pieces together

4.Explain how actin and myosin interact as a muscle cell contracts.

both actin and myosin

Andres Jaramillo- 27.5

Concept check 27.51.

1.Explain how muscles work in pairs in moving limbs.

2.Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.

3.Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.

4.Explain how actin and myosin interact as a muscle cell contracts.

Answers

1.Muscles always work in pairs and while one relaxes the other one contracts.

2.muscle fiber: long cylindrical muscle cell that contain nuclei
myofibrils: bundles of smaller units
actin: protein that makes up filaments
myosin:protein that make up thick filaments
sarcomere: muscle fiber basic unit of action


3. Muscles, bones and nerves are involved in hand shaking.
First you use your brain to coordinate. The eyes notice the presence of the other individual. Then use your muscles to relax and contract, then your nerves feels a sensation. You use 5 muscles (back, shoulder, upper arm, forearm, and wrist) and 27 bones.


4. Both actin and Myosin are proteins that make up filaments in the muscles.

Concept check 27.5
1. Explain how muscles work in pairs in moving limbs.
as one muscle contracts the other relaxes and vice versa
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
a muscle is made up of muscle fibers, muscle fibers are made up of myofibrils, these have sacromeres. sacromeres are made up of two types of filaments, thin (actin) and thick (myosin)
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
muscles, bones and nerves. your brain gives the message to give the hand shake. the muscles receive the order and the muscles contract and relax depending on the movement, and finally the muscles move with the bones to make the hand shake possible
4. Explain how actin and myosin interact as a muscle cell contracts.
myosin first binds thin filaments in each contraction. then the heads band to the center.

Concept check 27.5

Please read section 27.5 of the online Biology book on muscles. Take notes of the reading in your Health notebook. Post your answers to concept check 27.5 on the blog and provide constructive feedback to three other learners. Constructive feedback not only means you may agree with someone else's answers or ideas but as well how those ideas may open the doors to new learning opportunities.  Due date: Jan. 10, 2011

Concept check 27.5
1. Explain how muscles work in pairs in moving limbs.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
4. Explain how actin and myosin interact as a muscle cell contracts.

Concept Check 27.3

1. Homeostasis is very important in the body functioning. It is the proces in which the body mantains its temperature. This is important because the body´s temperature doesnt change, no matter what happens outside, so we are not affected that much about the outside temperature

2. The lungs are an example of an organ that exchanges cheimicals. The lungs, take oxygen from the air and turn it into carbon dioxide that they later release into the atmosphere. The oxygen stays and carbon dioxide leaves so there is the exchange

3.Our skin helps the body make homeostasis in many ways. First, the skin covers the internal organs, so they are protected and heated if the outside temperature changes. also, when the temperature inside increases too much, the skin makes the sweat leafe the body and the temperature gets regulated. Finally, the skin has the hair which also help to warm up the body when its too cold.

4. On a cold day, the body mantains its temperature with help from the skin. When the body feels old, the skin contracts and hairs rise and try to get the warm particles. this process is a goosebump

1.For maintaining the body temperature for your body to work properly for the production of enzymes

2. The lungs,they make oxygen.

3.Sweat control the temperature.
Hair protects the skin from the outside.
Protect you from the sun.

4. Goose bumps makes thebody to habve a stabletemperature by making you warm.

Homework

1. Homestasis is a state of equilibrium in which all the body systems, function and work appropriately, the interuption of homestasis or inbalanced state may cause psychosomatic and psychological disorders or distresses

2. The lungs, because they exchange gases such as oxigen or carbon dioxide which include a lot of tyes of chemicals, and also has fluids that help the exchange of gases during cellular respiration

3. Skin helps mantain a certain temperature in extreme situations, Skin provides protection of micro organisms sucha as bacteria, Skin produces sweat wich helps cool the body when there are hot outside temperatures

4. The appearing of goose bumps makes inside, muscles to contract and dont let leave heatness.

Martin Eguiguren

Homework final

My other post was missing a question

1. Explain why homeostasis is important to your body's functioning.

For our organs to work, and our cells to live, they have to be kept with in a set of conditions. In homeostasis, the internal conditions of the body are kept constant. That way, all the systems of your body can function properly. Additionally, the ability to keep homeostasis is essentatial for survival and health.

2. Give an example of an organ that exchanges chemicals, and explain how its structure allows this.

The lungs, preform the exchange of oxygen and carbon dioxide between the blood and the outside air. The structure of capillaries in our lungs fits their function because that way their is a larger surface for chemical exchange. These capillaries are vere tiny, and there are many of them.
3. Give three examples of ways your skin helps maintain homeostasis in your body.

• Seat glands produce sweat as a response to hot outer conditions in order to keep inner temperature.
• The skin serves as a physical barrier against dirt, viruses, and harmful microorganisms that may infect and harm the body.
• The skin provides insulation from extreme outer temperatures and cushion to avoid physical injury of organs.

4. Explain one way that your body maintains a constant temperature while outside on a cold day.

As a response to the stimulus of cold weather, you shiver. When you do so, your skeletal muscles contract. Thus, that contraction produces heat that stabilizes body temperature..

1. 1Explain why homeostasis is important to your body's functioning.

For it to maintain a correct temperature.

2. 2. Give an example of an organ that exchanges chemicals, and explain how its structure allows this.

Lungs because it has a fluid that helps it make cellular respiration

3. 3 Give three examples of ways your skin helps maintain homeostasis in your body.

Sweat helps the body to cool down in hot days. Shivering helps temperature to maintain inside in cold days. And little hairs in the skin help the body with the temperature and with the protection of skin.

4. 4 Explain one way that your body maintains a constant temperature while outside on a cold day.

Goose bumps is a way that makes the body maintain hot because it makes the muscles to contract and that way not let heat to leave the body

Ana Eguiguren

1. Explain why homeostasis is important to your body's functioning.
To maintain the right body temperature, so it let your body function properly so that it can make enzymes.

2. Give an example of an organ that exchanges chemicals, and explain how its structure allows this.
The lungs because it let the fluids make oxygen and pass though, to produce cellular respiration.

3. Give three examples of ways your skin helps maintain homeostasis in your body.
Sweat helps control the temperature and avoids you body from being cold.
Hair in the body helps control the temperature and protects the skin from any impure substance.
When you Shiver you create more heat , and maintain your body temperature.
4. Explain one way that your body maintains a constant temperature while outside on a cold day.
Goose bumps help you body to stay warm, because it keeps you temperature stable.

Patricio Cevallos

1. Homeostasis is significant because it maintains the right temperature for our tissues to survive.

2. Lungs because it allows the fluids make oxygen go through cells and tissues and cells produce cellular respiration and CO2 in the same way.

3. Little hairs in our body organize the body temperature and protect skin from impure substances. Sweat control heat in our temperature and avoid from overheat our body.
Shivering is a natural reply of our body releated to temperature.

4. Goose bumps protect our body from cold outside.

1. Explain why homeostasis is important to your body's functioning. It helps your body function properly because the enzyme function
2. Give an example of an organ that exchanges chemicals, and explain how its structure allows this. The lungs help oxygen to pass through the spaces in between cells, so they can produce cellular respiration.
3. Give three examples of ways your skin helps maintain homeostasis in your body.

When someone shivers it helps maintain their body temperature. Sweat avoids your body to stay cool, protects skin with evaporation. Hairs in the skin protect skin from bacteria (dirt), and helps with body temperature.
4. Explain one way that your body maintains a constant temperature while outside on a cold day...

To shiver, your hair in your skin protects and keeps your temperature stable.

ISABELA ITURRALDE

Rafael Gabela S.

1.Homeostasis is important because it maintains the correct temperature for our tissues to survive.

2.Lungs because it alows tha fluids make oxygen travel through cells and tissues and cells produce cellular respiration and CO2 in the same way.

3.Little hairs in our body control the body temperature and protect skin from impure substances. Sweat control heat in our temperature and prevent from overheat our body.
Shivering is a natural response of our body releated to temperature.

4. Goose bumps protect our body from cold outside.

1. homeostasis is important because it helpsmaintain the temperature in the body and this helps almost every organ in it

2. lungs: becuase it helps the body bring the co2 in it and it exchanges it with oxygen that nesessary for the body function. also helps to transport oxygen all round the body.

3. skin protects the body becuase its an outerlayer that helpsmaintain temperature
producing sweat helps the body not to cool down
the hairs in the skin protects itself from dust and other particles

4. shivering helps maintain the body temperature becuase it creates heat when the mucles contract

1. Explain why homeostasis is important to your body's functioning.
It's important because it maintains the adequate conditions, such as temperature, for tissues to survive

2. Give an example of an organ that exchanges chemicals, and explain how its structure allows this.
Lungs: interstitial fluid allows oxygen to travel through empty spaces between cells in tissues so cells can oxygenate and produce cellular respiration; CO2 is released by the same way.

3. Give three examples of ways your skin helps maintain homeostasis in your body.
Sweat avoids overheat, because it cools skin protecting it with the evaporation.
Hairs in the skin control temperature and protects skin from dirt.
Shivering is a response for maintaining temperature..


4. Explain one way that your body maintains a constant temperature while outside on a cold day.
Shivering maintains temperature inside body. Another way are the goose bumps created, they protect temperature from outer cold.