Copy of Structure and Function of Skeletal Muscles - Questions (5/28/2026)

Last updated about 2 hours ago

9 questions

Note from the author:

Instructions

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Copy of Structure and Function of Skeletal Muscles - Questions (5/28/2026)

Last updated about 2 hours ago

9 questions

Note from the author:

Use the provided notes covering the Structure and Function of Skeletal Muscles to help you answer the following questions.

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

Instructions

Use the provided notes covering the Structure and Function of Skeletal Muscles to help you answer the following questions.

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

Use the following notes to help you answer the following questions.

Notes - https://drive.google.com/file/d/1E1_tWyghpm3yOBjbItgtn2uDZs6SwHs8/view?usp=sharing

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

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Draggable item		Corresponding Item

5

Draggable item		Corresponding Item

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In muscle, the greater the innervation ratio of motor units, the greater its __________; and lower innervation ratios __________.

With isotonic contraction, the muscle maintains a constant __________ as it contracts; with isometric contraction, the muscle maintains a constant __________ as __________ increases.

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a.) Muscle constitutes approximately _______ % of adult body weight.
b.) Skeletal muscles are made up of _______ % water.
c.) There are three layers of tissue surrounding skeletal muscles; they are (from outside to inside): _______ , _______ , and _______ .
d.) There are approximately _______ skeletal muscles in the human body.
e.) Fusiform muscles are shaped like _______ and articulate from _______ to another.
f.) Type I muscle fibers are also known as _______ .
g.) The _______ is the smallest unit of muscle visible without a microscope.
h.) The _______ -band contains thick myosin filaments.
i.) Muscle contraction begins with an _______ that initiates in the neuromuscular junction.
j.) During relaxation, calcium ions are stored in the _______ .
k.) The primary function of muscle is to do _______ .
l.) Muscle fibers that rely on anaerobic pathways for ATP production are known as _______-twitch fibers.
m.) The _______ is the structural unit of contraction; it contains many _______ .
n.) Calcium ions are used to reveal the myosin-bind sites by binding to the _______ complex.
o.) Tendons attach _______ to bone at a site called the _______ .

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Use the provided notes covering the Structure and Function of Skeletal Muscles to help you answer the following questions.

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

Use the provided notes covering the Structure and Function of Skeletal Muscles to help you answer the following questions.

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

Use the following notes to help you answer the following questions.

Notes - https://drive.google.com/file/d/1E1_tWyghpm3yOBjbItgtn2uDZs6SwHs8/view?usp=sharing

Hint - you can search the pdf via "Ctrl + F" then by typing in a word or short phrase.

Match the following with their descriptors.

Draggable item		Corresponding Item
Agonist Muscle		Elongated and articulate from one joint to another.
Fusiform Muscles		Muscle that primarily uses aerobic pathways for ATP
Antagonist Muscles		Z-bands, I-bands, and A-band
Myofibrils		Tapers to form tendons
Tendons		Relaxed when the reciprocal muscle is contracted
Sarcomere		Functional unit of contraction.
Pennate Muscles		Contracted when the reciprocal muscle is relaxed
Type II Fibers		Broad and flat with fibers running obliquely.
Type I Fibers		Allow muscles to exert force on joints.
Epimysium		Cannot resist fatigue for long periods.

Match the following with their descriptors.

Draggable item		Corresponding Item
Myosin		Provides skeletal muscle with its striated appearance
Z-bands		Conducts action potentials for muscle contraction
Tendons		Structural unit of contraction
Myofibrils		Bundles muscle fibers into fascicles
Endomysium		Inhibits muscle contraction until calcium binds
Sarcoplasmic Reticulum		Transmits force from muscle to bone
Epimysium		Provides striated appearance to muscle fibers.
Perimysium		Surrounds individual muscle fibers
Sarcolemma		Stores calcium ions for muscle contraction
Troponin-Tropomyosin Complex		Thick filament involved in muscle contraction

In muscle, the greater the innervation ratio of motor units, the greater its __________; and lower innervation ratios __________.

With isotonic contraction, the muscle maintains a constant __________ as it contracts; with isometric contraction, the muscle maintains a constant __________ as __________ increases.

Sequence the events that occur in muscle contraction and then relaxation.

Cross-bridges breakdown; sarcomeres lengthen.
Ryanodine receptors open and calcium ions flow into the cytoplasm.
Muscle fiber action potential spreads along the sarcolemma
Troponin-tropomyosin complex returns to block the binding sites on actin.
Action potential in motor nerve reaches the neuromuscular junction.
Myosin uses ATP, forming actin-myosin cross-bridges, causing thin actin filaments to slide toward the thick myosin filaments; the sarcomere shortens.
Calcium moves back into the sarcoplasmic reticulum.
Calcium ions bind to troponin, causing a conformational change that opens binding sites on actin filaments.

a.) Muscle constitutes approximately _______ % of adult body weight.
b.) Skeletal muscles are made up of _______ % water.
c.) There are three layers of tissue surrounding skeletal muscles; they are (from outside to inside): _______ , _______ , and _______ .
d.) There are approximately _______ skeletal muscles in the human body.
e.) Fusiform muscles are shaped like _______ and articulate from _______ to another.
f.) Type I muscle fibers are also known as _______ .
g.) The _______ is the smallest unit of muscle visible without a microscope.
h.) The _______ -band contains thick myosin filaments.
i.) Muscle contraction begins with an _______ that initiates in the neuromuscular junction.
j.) During relaxation, calcium ions are stored in the _______ .
k.) The primary function of muscle is to do _______ .
l.) Muscle fibers that rely on anaerobic pathways for ATP production are known as _______-twitch fibers.
m.) The _______ is the structural unit of contraction; it contains many _______ .
n.) Calcium ions are used to reveal the myosin-bind sites by binding to the _______ complex.
o.) Tendons attach _______ to bone at a site called the _______ .

Which of the following would not impact muscle contractions?

Which of the following statements about skeletal muscles, ATP, and oxygen are true?

Skeletal muscle requires a constant supply of ATP for contraction.

Oxygen debt refers to excess oxygen available after exercise.

ATP production increases significantly during intense activity.

Muscle fibers can function without any oxygen for extended periods.

Phosphocreatine helps regenerate ATP during muscle activity.

Aerobic pathways produce ATP more efficiently than anaerobic pathways.

Which of the following statements accurately describe the steps involved in muscle contraction? (Select all that apply)

Excitation begins with an action potential from a nerve terminal.

Contraction occurs when myosin detaches from actin

Coupling involves calcium binding to troponin.

Relaxation occurs when calcium is released from the sarcoplasmic reticulum.

Which of the following steps are NOT part of the muscle contraction process? (Select all that apply)

Exicitation

Neural Inhibition

Contraction

Relaxation

Match the following with their descriptors.

Agonist Muscle

Elongated and articulate from one joint to another.

Fusiform Muscles

Muscle that primarily uses aerobic pathways for ATP

Antagonist Muscles

Z-bands, I-bands, and A-band

Myofibrils

Tapers to form tendons

Tendons

Relaxed when the reciprocal muscle is contracted

Sarcomere

Functional unit of contraction.

Pennate Muscles

Contracted when the reciprocal muscle is relaxed

Type II Fibers

Broad and flat with fibers running obliquely.

Type I Fibers

Allow muscles to exert force on joints.

Epimysium

Cannot resist fatigue for long periods.

Match the following with their descriptors.

Myosin

Provides skeletal muscle with its striated appearance

Z-bands

Conducts action potentials for muscle contraction

Tendons

Structural unit of contraction

Myofibrils

Bundles muscle fibers into fascicles

Endomysium

Inhibits muscle contraction until calcium binds

Sarcoplasmic Reticulum

Transmits force from muscle to bone

Epimysium

Provides striated appearance to muscle fibers.

Perimysium

Surrounds individual muscle fibers

Sarcolemma

Stores calcium ions for muscle contraction

Troponin-Tropomyosin Complex

Thick filament involved in muscle contraction

Sequence the events that occur in muscle contraction and then relaxation.

Cross-bridges breakdown; sarcomeres lengthen.

Ryanodine receptors open and calcium ions flow into the cytoplasm.

Muscle fiber action potential spreads along the sarcolemma

Troponin-tropomyosin complex returns to block the binding sites on actin. 

Action potential in motor nerve reaches the neuromuscular junction.

Myosin uses ATP, forming actin-myosin cross-bridges, causing thin actin filaments to slide toward the thick myosin filaments; the sarcomere shortens.

Calcium moves back into the sarcoplasmic reticulum.

Calcium ions bind to troponin, causing a conformational change that opens binding sites on actin filaments.

Which of the following would not impact muscle contractions?

Fiber type

Muscle temperature

Fat levels

Innervation ratio

Muscle color

Sunlight

Which of the following statements about skeletal muscles, ATP, and oxygen are true?

Skeletal muscle requires a constant supply of ATP for contraction.

Oxygen debt refers to excess oxygen available after exercise.

ATP production increases significantly during intense activity.

Muscle fibers can function without any oxygen for extended periods.

Phosphocreatine helps regenerate ATP during muscle activity.

Aerobic pathways produce ATP more efficiently than anaerobic pathways.

Which of the following statements accurately describe the steps involved in muscle contraction? (Select all that apply)

Excitation begins with an action potential from a nerve terminal.

Contraction occurs when myosin detaches from actin

Coupling involves calcium binding to troponin.

Relaxation occurs when calcium is released from the sarcoplasmic reticulum.

Which of the following steps are NOT part of the muscle contraction process? (Select all that apply)

Exicitation

Neural Inhibition

Contraction

Relaxation