Q: Which equation best represents the breakdown of ATP during muscle contraction?

$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$

Q: Which equation represents the process of aerobic respiration in muscle cells?

$\mathrm{C_6H_{12}O_6} + 6\mathrm{O_2} \rightarrow 6\mathrm{CO_2} + 6\mathrm{H_2O} + \text{energy}$

Question 1

Which of the following is NOT a major function of muscle tissue in the human body?

Accepted Answer

Production of blood cells

Question 2

A patient is diagnosed with a disorder affecting the sarcomeres in their muscle fibers. Which type of muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 3

Compare and contrast skeletal, cardiac, and smooth muscle tissue. Which statement is correct?

Accepted Answer

Skeletal muscle is striated and voluntary, while cardiac muscle is striated and involuntary.

Question 4

Which structural characteristic is unique to cardiac muscle tissue?

Accepted Answer

Intercalated discs

Question 5

A muscle fiber receives a signal from a motor neuron at the neuromuscular junction. What is the correct sequence of events leading to muscle contraction?

Accepted Answer

Release of acetylcholine, depolarization of sarcolemma, calcium release from sarcoplasmic reticulum, actin-myosin crossbridge formation

Question 6

Which equation best represents the breakdown of ATP during muscle contraction?

Accepted Answer

$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$

Question 7

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

Accepted Answer

It stores and releases calcium ions necessary for contraction.

Question 8

A patient presents with muscle weakness due to impaired excitation-contraction coupling. Which process is most likely disrupted?

Accepted Answer

Transmission of the action potential from the sarcolemma to the T-tubules

Question 9

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

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 10

During a marathon, which muscle fiber type is primarily used for sustained, endurance activity?

Accepted Answer

Slow oxidative (Type I) fibers

Question 11

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

Accepted Answer

Troponin

Question 12

Which of the following best explains the sliding filament theory of muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere

Question 13

Which connective tissue layer surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 14

A patient is unable to produce enough acetylcholine at the neuromuscular junction. What is the most likely effect?

Accepted Answer

Reduced muscle contraction due to lack of stimulation

Question 15

Which of the following is a regulatory protein found in skeletal muscle fibers?

Accepted Answer

Tropomyosin

Question 16

Which equation represents the process of aerobic respiration in muscle cells?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\mathrm{O_2} ightarrow 6\mathrm{CO_2} + 6\mathrm{H_2O} + 	ext{energy}$

Question 17

Which of the following best describes the function of myofibrils in muscle fibers?

Accepted Answer

They contain the contractile proteins responsible for muscle contraction.

Question 18

Which of the following is true regarding the organization of skeletal muscle from largest to smallest structure?

Accepted Answer

Muscle, fascicle, muscle fiber, myofibril, sarcomere

Question 19

Which type of muscle tissue is responsible for peristalsis in the digestive tract?

Accepted Answer

Smooth muscle

Muscular System: Structure, Function, and Physiology

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