$$\text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{energy}$$

Question 1

Which of the following best describes the primary function of all muscle tissue?

Accepted Answer

To generate force and/or movement in response to a physiological stimulus

Question 2

Which muscle type is characterized by being striated, multinucleated, and primarily under voluntary control?

Accepted Answer

Skeletal muscle

Question 3

In the sliding filament model of muscle contraction, which protein directly binds to calcium ions to initiate contraction?

Accepted Answer

Troponin C

Question 4

Which structure is the attachment site for thin filaments in a sarcomere?

Accepted Answer

Z disk

Question 5

A muscle cell's membrane is called the sarcolemma. Which of the following is the correct muscle equivalent for cytoplasm?

Accepted Answer

Sarcoplasm

Question 6

Which protein is responsible for stabilizing the thick filaments and providing elastic recoil in muscle?

Accepted Answer

Titin

Question 7

During flexion of the forearm, which muscle contracts and which relaxes?

Accepted Answer

Biceps contracts, triceps relaxes

Question 8

Which of the following statements about cardiac muscle is TRUE?

Accepted Answer

It is striated, uninucleated, and primarily involuntary

Question 9

Which of the following best describes the role of tropomyosin in muscle contraction?

Accepted Answer

It regulates the binding of myosin to actin by covering the binding sites

Question 10

A motor unit consists of:

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 11

Which of the following is TRUE regarding the energy expenditure of skeletal muscle?

Accepted Answer

It accounts for 15-60% of daily energy expenditure depending on activity level

Question 12

Which band of the sarcomere contains only thick filaments?

Accepted Answer

H zone

Question 13

Which of the following is a function of smooth muscle?

Accepted Answer

Mechanical control of blood vessels and airways

Question 14

Which component of the thin filament inhibits contraction by binding to actin under resting conditions?

Accepted Answer

Troponin I

Question 15

Which equation best represents the conversion of chemical energy to mechanical energy in muscle contraction?

Accepted Answer

$$	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i + 	ext{energy}$$

Question 16

Which protein is believed to regulate the length of thin filaments and contribute to the structural integrity of myofibrils?

Accepted Answer

Nebulin

Question 17

During muscle contraction, which event occurs first at the neuromuscular junction?

Accepted Answer

Action potential arrives at the motor neuron terminal

Question 18

Which of the following is TRUE about the sarcomere?

Accepted Answer

The Z disk is the attachment site for thin filaments

Question 19

Which muscle type is primarily controlled by the autonomic nervous system and hormones, and is non-striated?

Accepted Answer

Smooth muscle

Question 20

Which of the following best describes the role of the regulatory light chain in myosin?

Accepted Answer

It regulates ATPase activity of myosin

oct 19 (muscle)

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