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.
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.
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.
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.
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