Q: Which equation best represents the action of the Na+/K+ ATPase pump in maintaining the resting membrane potential?

$$2\ \text{K}^+\ \text{in} + 3\ \text{Na}^+\ \text{out} + 1\ \text{ATP} \rightarrow \text{resting potential}$$

Q: During intense exercise lasting less than 10 seconds, which equation best describes the reaction providing ATP?

$$\text{Creatine phosphate} + \text{ADP} \rightarrow \text{Creatine} + \text{ATP}$$

Question 1

Which of the following is a primary function of muscle tissue in the human body?

Accepted Answer

Generation of heat

Question 2

A skeletal muscle fiber contains many myofibrils. Which structural component of a myofibril is responsible for the actual shortening during contraction?

Accepted Answer

Sarcomere

Question 3

Which protein is classified as a regulatory protein in the sarcomere and is directly involved in controlling the exposure of binding sites on actin?

Accepted Answer

Troponin

Question 4

During muscle contraction, the sliding-filament mechanism involves:

Accepted Answer

Actin filaments sliding past myosin filaments, shortening the sarcomere

Question 5

Which equation best represents the action of the Na+/K+ ATPase pump in maintaining the resting membrane potential?

Accepted Answer

$$2\ 	ext{K}^+\ 	ext{in} + 3\ 	ext{Na}^+\ 	ext{out} + 1\ 	ext{ATP} ightarrow 	ext{resting potential}$$

Question 6

A patient is experiencing muscle weakness due to a defect in the neuromuscular junction. Which step is most likely impaired?

Accepted Answer

Release of acetylcholine from the motor neuron

Question 7

Excitation-contraction coupling refers to:

Accepted Answer

The process by which an action potential leads to muscle contraction

Question 8

Which immediate energy source is used by muscle fibers for rapid, short bursts of activity?

Accepted Answer

Creatine phosphate

Question 9

During intense exercise lasting less than 10 seconds, which equation best describes the reaction providing ATP?

Accepted Answer

$$	ext{Creatine phosphate} + 	ext{ADP} ightarrow 	ext{Creatine} + 	ext{ATP}$$

Question 10

Which type of muscle fiber is most resistant to fatigue and is best suited for endurance activities?

Accepted Answer

Type I (slow-twitch)

Question 11

A muscle twitch consists of three stages. Which stage is characterized by the time between the arrival of the stimulus and the beginning of contraction?

Accepted Answer

Latent period

Question 12

If a sarcomere is stretched beyond its optimal length, what happens to the tension produced during contraction?

Accepted Answer

Tension decreases due to reduced overlap of actin and myosin

Question 13

Which of the following best describes a motor unit?

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 14

Muscular fatigue during prolonged exercise is most likely caused by:

Accepted Answer

Accumulation of lactic acid and depletion of ATP

Question 15

During the recovery period after intense exercise, which event occurs to restore muscle function?

Accepted Answer

Removal of lactic acid and replenishment of ATP stores

Question 16

Which of the following statements correctly distinguishes cardiac muscle from skeletal muscle?

Accepted Answer

Cardiac muscle cells are branched and interconnected by intercalated discs

Question 17

Smooth muscle contraction differs from skeletal muscle contraction in that:

Accepted Answer

Smooth muscle uses calmodulin instead of troponin for calcium binding

Question 18

A patient with a genetic mutation affecting titin would most likely experience problems with:

Accepted Answer

Maintaining structural integrity and elasticity of the sarcomere

Question 19

Which scenario best illustrates the application of the sliding-filament mechanism in a real-life situation?

Accepted Answer

A sprinter rapidly contracts leg muscles to propel forward

Question 20

Which equation best represents the glycolytic pathway for ATP production during moderate exercise?

Accepted Answer

$$	ext{Glucose} ightarrow 2\ 	ext{Pyruvate} + 2\ 	ext{ATP}$$

Muscle Tissue and Muscle Physiology: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards