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1. Muscles move tendons attached to bone by performing an action called _______.

2. Myosin and ______ are two proteins that interact to contract muscles.
3. _______ connect muscles to bones.
4. The layer of skin that grows new cells rapidly is called the _______.
5. The _______ is the layer of skin that regulates body temperature.
6. _______ can occur when pores become clogged with dirt or oil, or become infected.

7. Explain what happens at a microscopic level inside a muscle fiber during contraction, beginning with the nerve impulse.

User Veducm
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Answer:

1. Contraction

2. Actin

3. Tendons

4. Epidermis

5. Dermis

6. Acne

7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.

Step-by-step explanation:

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User Marc Abramowitz
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3.5k points
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1. Contraction

2. Actin

3. Tendons

4. Epidermis

5. Dermis

6. Acne

7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.

For Penn Foster.

User Jonathancardoso
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4.0k points