Question 1

Which of the following is a primary function shared by all muscle types?

Accepted Answer

Generation of force and/or movement in response to a physiological stimulus

Question 2

Which muscle type is primarily voluntary and controlled by somatic motor neurons?

Accepted Answer

Skeletal muscle

Question 3

What is the correct order of structures from largest to smallest in skeletal muscle organization?

Accepted Answer

Muscle fiber → Myofibril → Sarcomere → Myofilament

Question 4

Which protein is responsible for binding calcium during skeletal muscle contraction?

Accepted Answer

Troponin C

Question 5

During muscle contraction, which band of the sarcomere shortens?

Accepted Answer

I band

Question 6

Which equation best represents the hydrolysis of ATP by myosin during muscle contraction?

Accepted Answer

$$ATP + H_2O \rightarrow ADP + P_i + Energy$$

Question 7

A patient presents with muscle weakness. Which structure is most likely affected if the transmission of the action potential from the neuron to the muscle fiber is impaired?

Accepted Answer

Neuromuscular junction

Question 8

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

Accepted Answer

Constriction of blood vessels

Question 9

Which protein stabilizes thick filaments and contributes to the elasticity of muscle?

Accepted Answer

Titin

Question 10

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

Accepted Answer

Blocks myosin binding sites on actin in resting muscle

Question 11

Which muscle type is striated and uninucleated, and its activity can be altered by autonomic input and hormones?

Accepted Answer

Cardiac muscle

Question 12

Which of the following structures stores calcium ions required for muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 13

Which of the following is the correct definition of a motor unit?

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Question 14

Which of the following is the correct sequence for excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential → Release of Ca$$^{2+}$$ from sarcoplasmic reticulum → Muscle contraction

Question 15

Which of the following is a correct description of the sarcomere?

Accepted Answer

Region between two Z lines

Question 16

Which of the following best explains why skeletal muscle fibers are multinucleated?

Accepted Answer

They are formed by the fusion of multiple myoblasts during development

Question 17

Which equation best represents the relationship between force (F), mass (m), and acceleration (a) in muscle movement?

Accepted Answer

$$F = m 	imes a$$

Question 18

Which of the following is a function of smooth muscle but NOT skeletal muscle?

Accepted Answer

Constriction of organs and vessels

Question 19

Which protein regulates the length of thin filaments and contributes to the structural integrity of myofibrils?

Accepted Answer

Nebulin

Question 20

A patient with a mutation in the gene encoding for myosin light chain would most likely have a defect in which process?

Accepted Answer

Regulation of ATPase activity during muscle contraction

Muscle Tissue: Structure, Function, and Types

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