Question 1

Which of the following best describes the role of a synergist muscle during movement?

Accepted Answer

It assists the prime mover by adding force or reducing unnecessary movements.

Question 2

A muscle fiber is surrounded by which connective tissue layer?

Accepted Answer

Endomysium

Question 3

During muscle contraction, which event occurs according to the sliding filament theory?

Accepted Answer

Myosin heads bind to actin and pull the actin filaments toward the center of the sarcomere.

Question 4

Which structure is NOT part of the neuromuscular junction?

Accepted Answer

Sarcoplasmic reticulum

Question 5

A patient is unable to maintain a muscle contraction for more than a few seconds. Which factor is most likely contributing to their muscle fatigue?

Accepted Answer

Accumulation of lactic acid in the muscle tissue

Question 6

Which equation best represents the relationship between muscle tension and muscle length?

Accepted Answer

$$ T = T_{max} \cdot \left(1 - \frac{|L - L_{opt}|}{L_{opt}}\right) $$

Question 7

Which of the following best differentiates slow twitch muscle fibers from fast twitch muscle fibers?

Accepted Answer

Slow twitch fibers are oxidative and used for prolonged contractions.

Question 8

During excitation-contraction coupling, which sequence of events is correct?

Accepted Answer

Acetylcholine released → Action potential generated in muscle fiber → Calcium released from sarcoplasmic reticulum → Troponin binds calcium → Cross-bridge formation

Question 9

Which of the following is true regarding isometric and isotonic muscle contractions?

Accepted Answer

Isotonic contractions involve a change in muscle length with constant tension.

Question 10

A muscle twitch consists of which three phases?

Accepted Answer

Latent period, contraction phase, relaxation phase

Question 11

Which of the following is a way to increase muscle contraction strength?

Accepted Answer

Recruiting more motor units

Question 12

Which of the following best describes the difference between large and small motor units?

Accepted Answer

Small motor units are found in muscles requiring precise control, such as those in the fingers.

Question 13

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

Accepted Answer

Calcification

Question 14

Which of the following best describes the immediate source of energy for muscle contraction?

Accepted Answer

Creatine phosphate

Question 15

Which muscle type is characterized by involuntary control, striations, and intercalated discs?

Accepted Answer

Cardiac muscle

Question 16

A muscle fiber contains which of the following structures responsible for storing calcium ions?

Accepted Answer

Sarcoplasmic reticulum

Question 17

Which of the following best explains why cardiac muscle cannot undergo tetanus?

Accepted Answer

Cardiac muscle has a long refractory period preventing sustained contraction.

Question 18

Which of the following is the correct sequence for the bundle-within-a-bundle organization of skeletal muscle?

Accepted Answer

Epimysium → Perimysium → Fascicle → Endomysium → Muscle fiber

Question 19

Which of the following best describes the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It binds to receptors on the sarcolemma, initiating an action potential in the muscle fiber.

Question 20

A marathon runner is most likely to have a higher proportion of which muscle fiber type?

Accepted Answer

Slow twitch oxidative fibers

Muscle Tissue and Contraction: ANP Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards