$$\text{Creatine~phosphate} + \text{ADP} \xrightarrow{\text{creatine~kinase}} \text{Creatine} + \text{ATP}$$

Question 1

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

Accepted Answer

Hormone secretion

Question 2

A muscle fiber is multinucleated because:

Accepted Answer

Myoblasts fuse together during embryonic development

Question 3

Which connective tissue layer surrounds each individual muscle fiber?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which event occurs FIRST in the excitation-contraction coupling process?

Accepted Answer

Generation of an action potential along the sarcolemma

Question 5

Which structure is responsible for storing and releasing Ca$$^{2+}$$ during muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 6

A motor unit consists of:

Accepted Answer

A single motor neuron and all the skeletal muscle fibers it controls

Question 7

Which of the following best describes the role of creatine phosphate in muscle metabolism?

Accepted Answer

It donates a phosphate group to ADP to rapidly regenerate ATP

Question 8

Which equation represents the reaction catalyzed by creatine kinase during rapid ATP regeneration?

Accepted Answer

$$	ext{Creatine~phosphate} + 	ext{ADP} \xrightarrow{	ext{creatine~kinase}} 	ext{Creatine} + 	ext{ATP}$$

Question 9

Which muscle fiber type is most resistant to fatigue and is best suited for endurance activities?

Accepted Answer

Slow oxidative (SO) fibers

Question 10

During a muscle twitch, the latent period corresponds to:

Accepted Answer

The time between stimulus and the onset of contraction

Question 11

Which of the following best explains muscle fatigue during intense exercise?

Accepted Answer

Accumulation of lactic acid and depletion of ATP

Question 12

Which statement correctly distinguishes between isometric and isotonic contractions?

Accepted Answer

Isometric contractions occur when muscle tension is less than resistance, resulting in no movement

Question 13

Which protein anchors the outer myofibrils to proteins within the sarcolemma and endomysium?

Accepted Answer

Dystrophin

Question 14

A patient is diagnosed with Duchenne muscular dystrophy, a disease affecting the protein dystrophin. Which of the following is a likely consequence?

Accepted Answer

Impaired anchoring of myofibrils to the sarcolemma, leading to muscle weakness

Question 15

Which of the following best describes the sliding filament theory?

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere

Question 16

Which of the following is TRUE regarding the length-tension relationship in skeletal muscle contraction?

Accepted Answer

Maximum tension is generated when the muscle is at its resting length

Question 17

Which equation best represents aerobic cellular respiration in skeletal muscle?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{ATP}$$

Question 18

Which of the following is a primary difference between single-unit and multiunit smooth muscle?

Accepted Answer

Single-unit smooth muscle contracts in unison due to gap junctions, while multiunit smooth muscle contracts independently

Question 19

Which structure is the site of neurotransmitter release at the neuromuscular junction?

Accepted Answer

Synaptic knob

Question 20

A marathon runner is experiencing oxygen debt after a race. Which of the following best explains why oxygen debt occurs?

Accepted Answer

Oxygen is required to restore ATP, creatine phosphate, and remove lactic acid accumulated during exercise

Chapter 9: Muscles and Muscle Tissue – Study Guide

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