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