Q: Which equation best represents the action of the Na+/K+ pump?

$$3\ \text{Na}^+_{\text{in}} + 2\ \text{K}^+_{\text{out}} + \text{ATP} \rightarrow 3\ \text{Na}^+_{\text{out}} + 2\ \text{K}^+_{\text{in}} + \text{ADP} + \text{P}_i$$

Q: Which equation represents the resting membrane potential of a muscle cell?

$$V_{\text{rest}} = -85\ \text{mV}$$

Question 1

Which property of muscle cells allows them to return to their original length after being stretched?

Accepted Answer

Elasticity

Question 2

During muscle contraction, which band of the sarcomere remains unchanged in length?

Accepted Answer

A band

Question 3

What is the primary function of the Na+/K+ pump in muscle cells?

Accepted Answer

To maintain the concentration gradients of Na+ and K+ across the sarcolemma

Question 4

Which equation best represents the action of the Na+/K+ pump?

Accepted Answer

$$3\ 	ext{Na}^+_{	ext{in}} + 2\ 	ext{K}^+_{	ext{out}} + 	ext{ATP} ightarrow 3\ 	ext{Na}^+_{	ext{out}} + 2\ 	ext{K}^+_{	ext{in}} + 	ext{ADP} + 	ext{P}_i$$

Question 5

Which protein is responsible for blocking the active sites of actin in a relaxed skeletal muscle?

Accepted Answer

Tropomyosin

Question 6

A marathon runner's postural muscles are most likely composed predominantly of which type of muscle fiber?

Accepted Answer

Type I (slow-twitch)

Question 7

Which of the following best describes the sliding filament theory?

Accepted Answer

Thin filaments slide toward the M line, causing the sarcomere to shorten

Question 8

Which phase of muscle contraction involves the propagation of an action potential along the sarcolemma and into the T-tubules?

Accepted Answer

Excitation phase

Question 9

What is the main function of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

To degrade acetylcholine, ending muscle stimulation

Question 10

Which of the following is NOT a function of muscle tissue?

Accepted Answer

Producing hormones

Question 11

During the crossbridge cycle, what event directly requires ATP?

Accepted Answer

Release of myosin head from actin

Question 12

Which type of muscle tissue is characterized by intercalated discs and autorhythmicity?

Accepted Answer

Cardiac muscle

Question 13

Which of the following best describes wave summation?

Accepted Answer

Increase in muscle tension caused by repeated stimulation before relaxation occurs

Question 14

What is the optimal length-tension relationship for a sarcomere?

Accepted Answer

100–120% of its natural length

Question 15

Which equation represents the resting membrane potential of a muscle cell?

Accepted Answer

$$V_{	ext{rest}} = -85\ 	ext{mV}$$

Question 16

Which of the following is a unique feature of smooth muscle compared to skeletal muscle?

Accepted Answer

Ability to contract up to 80% of resting length

Question 17

Which type of muscle contraction occurs when the muscle generates tension but does not change length?

Accepted Answer

Isometric contraction

Question 18

What is the primary cause of rigor mortis after death?

Accepted Answer

Depletion of ATP prevents myosin heads from detaching from actin

Question 19

Which of the following changes is most likely to occur in muscle fibers after resistance training?

Accepted Answer

Increase in diameter of muscle fibers (hypertrophy)

Question 20

Which of the following is a function of muscle tone?

Accepted Answer

Maintaining posture and stabilizing joints

Muscle Tissue and Physiology: Structured Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드