Q: Which equation best represents the breakdown of ATP during muscle contraction?

$$ATP \rightarrow ADP + P_i + \text{energy}$$

Question 1

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions ($$Ca^{2+}) $$necessary for muscle fiber contraction.

Question 2

A muscle acting as a prime mover during elbow flexion is:

Accepted Answer

Biceps brachii

Question 3

Which statement correctly explains the difference between isotonic and isometric contractions?

Accepted Answer

Isotonic contractions result in muscle length change, while isometric contractions maintain muscle length.

Question 4

During the cross bridge cycle, which event directly follows the binding of myosin to actin?

Accepted Answer

The power stroke, where myosin pulls actin toward the center of the sarcomere.

Question 5

Which equation best represents the breakdown of ATP during muscle contraction?

Accepted Answer

$$ATP ightarrow ADP + P_i + 	ext{energy}$$

Question 6

A patient is unable to produce smooth, graded contractions in their skeletal muscles. Which process is most likely impaired?

Accepted Answer

Motor unit recruitment and temporal summation

Question 7

Which of the following muscle arrangements allows for the greatest range of motion but the least power?

Accepted Answer

Parallel fascicle arrangement

Question 8

In a third-class lever system, which of the following is the correct arrangement?

Accepted Answer

The effort is applied between the fulcrum and the load.

Question 9

Which of the following is NOT a criterion used in naming skeletal muscles?

Accepted Answer

The color of the muscle

Question 10

If a muscle's origin is on the scapula and its insertion is on the radius, what is the most likely action of this muscle?

Accepted Answer

Flexion of the forearm at the elbow

Question 11

Which process is responsible for the rapid transmission of an action potential along the muscle fiber?

Accepted Answer

Propagation along the T-tubules

Question 12

Which of the following best explains why anaerobic muscle contraction is less efficient than aerobic contraction?

Accepted Answer

Anaerobic contraction produces less ATP per glucose molecule.

Question 13

A muscle twitch consists of which three phases?

Accepted Answer

Latent period, contraction phase, relaxation phase

Question 14

Which factor would most likely increase the force generated by a skeletal muscle contraction?

Accepted Answer

Increasing the number of active motor units

Question 15

Which of the following is a function of a synergist muscle?

Accepted Answer

Assisting the prime mover by adding extra force or reducing undesirable movements

Question 16

Which of the following best describes the effect of aerobic exercise on skeletal muscle?

Accepted Answer

Increases mitochondrial density and capillary supply

Question 17

Which pattern of fascicle arrangement is most likely to generate the greatest power?

Accepted Answer

Multipennate

Question 18

A muscle contraction that maintains tension but does not change length is called:

Accepted Answer

Isometric contraction

Question 19

Which of the following best describes the mechanical advantage of a lever system?

Accepted Answer

$$	ext{Mechanical Advantage} = \frac{	ext{Length of Effort Arm}}{	ext{Length of Load Arm}}$$

Question 20

Which of the following is the correct sequence of events for excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential travels along sarcolemma $$\rightarrow T-$$tubules $$\rightarrow$$ release of $$Ca^{2+}$$ from sarcoplasmic reticulum $$\rightarrow$$ cross bridge formation

Muscular System: Structure, Function, and Physiology

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