Question 1

Which of the following best describes the structural and functional classification of a suture joint in the human skull?

Accepted Answer

Fibrous joint; synarthrosis (immovable)

Question 2

A patient presents with inflammation of the bursae in the shoulder. What is the primary function of bursae in synovial joints?

Accepted Answer

To reduce friction between moving structures such as tendons and bones

Question 3

Which of the following statements about the meniscus in the knee joint is correct?

Accepted Answer

It is a fibrocartilaginous structure that improves the fit between articulating bones and absorbs shock

Question 4

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

Accepted Answer

It stores and releases $$\mathrm{Ca$$^{2+}$$}$$ ions necessary for muscle contraction

Question 5

During muscle contraction, what is the role of ATP in the cross-bridge cycle?

Accepted Answer

ATP binds to myosin, causing it to detach from actin and re-cock for another power stroke

Question 6

A person is unable to move their jaw after receiving a botulinum toxin (Botox) injection. What is the mechanism of action of Botox at the neuromuscular junction?

Accepted Answer

It prevents the release of acetylcholine from the presynaptic neuron

Question 7

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

ATP production ceases, preventing detachment of myosin from actin

Question 8

Which of the following is a characteristic of Type I muscle fibers?

Accepted Answer

High myoglobin content, slow contraction speed, resistant to fatigue

Question 9

A muscle is stretched beyond its optimal length before contraction. What is the most likely effect on the force generated during contraction?

Accepted Answer

The force generated will decrease due to reduced overlap between actin and myosin filaments

Question 10

Which of the following best describes an isometric muscle contraction?

Accepted Answer

Muscle tension increases but the muscle does not change length

Question 11

Which of the following is the most common type of lever system in the human body?

Accepted Answer

Third-class lever

Question 12

What is the primary function of articular cartilage in synovial joints?

Accepted Answer

To reduce friction and absorb shock at the joint surfaces

Question 13

Which of the following best describes the events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Acetylcholine is released, binds to receptors on the muscle cell, causing depolarization and action potential propagation

Question 14

Which of the following is a function of synovial fluid?

Accepted Answer

Lubrication of joint surfaces and nourishment of articular cartilage

Question 15

Which of the following best explains why muscle fatigue occurs during intense exercise when oxygen is limited?

Accepted Answer

Muscle cells rely on anaerobic glycolysis, producing less ATP and accumulating lactic acid

Question 16

What is the role of creatine phosphate in muscle contraction?

Accepted Answer

It donates a phosphate group to ADP to rapidly regenerate ATP during short bursts of activity

Question 17

Which of the following best describes a motor unit?

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 18

Which type of muscle tissue is involuntary and striated?

Accepted Answer

Cardiac muscle

Question 19

Which of the following best describes the difference between tendons and aponeuroses?

Accepted Answer

Tendons are cord-like structures attaching muscle to bone; aponeuroses are broad, flat sheets attaching muscle to muscle or bone

Question 20

Which of the following best explains the relationship between the number of motor units recruited and muscle tension?

Accepted Answer

Increasing the number of motor units recruited increases the total muscle tension generated

BIO 111 Module II Study Guide: Joints and Muscle Tissue – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards