Which of the following is a function of muscle cells? a. Movement b. Hormone sec

Question

Which of the following is a function of muscle cells? a. Movement b. Hormone secretion c. Protection d. Signal transduction Skeletal muscles have the ability to be stretched. What is this ability called? a. Contractility b. Excitability c. Elasticity d. Extensibility Skeletal muscles have the ability to return to their resting length. What is this ability called? a. Contractility b. Excitability c. Elasticity d. Extensibility Which is the outermost layer of connective tissue in muscles? a. Endomysium b. Perimysium c. Ectomysium d. Epimysium What structure allows the depolarization of the sarcolemma to penetrate deep into the interior of the muscle cell? a. Sarcoplasmic reticulum b. Z-disks c. Terminal cisternae d. T-tubules Approximately what percent of the available energy in ATP can muscles turn into useful work? a. 10% b. 25% c. 40% d. 95%

Explanation / Answer

1. A. Movement.

Muscle cells also called muscle fibers are involved in movement and locomotion.

2. D. Extensibility.

Extensibility means that muscles can be stretched to their normal resting length and beyond to a limited degree.

3. C. Elasticity.

Elssticity refers to the ability of muscle cells to retain their original shape after they are stretched.

4. D. Epimysium.

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