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Structure Of Skeletal Muscles MDCAT MCQs with Answers

Structure Of Skeletal Muscles MDCAT MCQs

Welcome to the Structure Of Skeletal Muscles MDCAT MCQs with Answers. In this post, we have shared Structure Of Skeletal Muscles Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Structure Of Skeletal Muscles MCQs in this MDCAT Online Test.

The functional unit of a skeletal muscle is the: a) Myofibril
b) Sarcomere
c) Muscle fiber
d) Fascicle

Answer
b) Sarcomere

Which structure surrounds each muscle fiber? a) Epimysium
b) Perimysium
c) Endomysium
d) Fascicle

Answer
c) Endomysium

The connective tissue sheath surrounding a group of muscle fibers is called the: a) Endomysium
b) Perimysium
c) Epimysium
d) Sarcolemma

Answer
b) Perimysium

Muscle fibers are made up of: a) Myofibrils
b) Sarcomeres
c) Actin and myosin
d) Collagen fibers

Answer
a) Myofibrils

The outermost layer of connective tissue surrounding the whole muscle is: a) Endomysium
b) Perimysium
c) Epimysium
d) Sarcoplasm

Answer
c) Epimysium

The structural and functional unit of a muscle fiber is the: a) Myofibril
b) Sarcomere
c) Muscle fiber
d) Fascicle

Answer
b) Sarcomere

Muscle fibers are wrapped in a membrane called the: a) Endomysium
b) Perimysium
c) Epimysium
d) Sarcolemma

Answer
d) Sarcolemma

Actin and myosin are types of: a) Connective tissue
b) Muscle fibers
c) Myofilaments
d) Muscle fascicles

Answer
c) Myofilaments

The term “striations” in skeletal muscle refers to: a) The orientation of muscle fibers
b) The arrangement of actin and myosin
c) The color of the muscle
d) The type of muscle contraction

Answer
b) The arrangement of actin and myosin

The Z-line in a sarcomere marks the boundary of: a) The A band
b) The I band
c) The H zone
d) The M line

Answer
b) The I band

Which structure is responsible for the striated appearance of skeletal muscle? a) Myofibrils
b) Actin filaments
c) Myosin filaments
d) The regular arrangement of myofilaments

Answer
d) The regular arrangement of myofilaments

The M-line in a sarcomere is located in the: a) I band
b) A band
c) H zone
d) Z-line

Answer
c) H zone

Muscle fibers are grouped into bundles called: a) Myofibrils
b) Fascicles
c) Myofilaments
d) Endomysium

Answer
b) Fascicles

The thick filaments in a sarcomere are primarily composed of: a) Actin
b) Myosin
c) Tropomyosin
d) Troponin

Answer
b) Myosin

The thin filaments in a sarcomere are primarily composed of: a) Myosin
b) Actin
c) Tropomyosin
d) Troponin

Answer
b) Actin

The basic repeating unit of a myofibril is called a: a) Myofilament
b) Sarcomere
c) Muscle fiber
d) Fascicle

Answer
b) Sarcomere

The space between two Z-lines in a sarcomere is known as: a) The A band
b) The I band
c) The H zone
d) The M line

Answer
b) The I band

The H zone within the A band of a sarcomere is made up of: a) Actin filaments
b) Myosin filaments
c) Both actin and myosin filaments
d) None of the above

Answer
b) Myosin filaments

Which of the following structures is NOT part of a sarcomere? a) Z-line
b) M-line
c) Sarcoplasmic reticulum
d) A-band

Answer
c) Sarcoplasmic reticulum

The connection between muscle fibers and the nervous system occurs at the: a) Neuromuscular junction
b) Sarcomere
c) Tendon
d) Fascicle

Answer
a) Neuromuscular junction

The structural unit of a muscle fiber that contains myofibrils is the: a) Fascicle
b) Sarcomere
c) Myofibril
d) Myofilament

Answer
c) Myofibril

The sliding filament theory explains muscle contraction as: a) The movement of actin and myosin filaments
b) The increase in muscle length
c) The change in muscle color
d) The generation of electrical impulses

Answer
a) The movement of actin and myosin filaments

The sarcoplasmic reticulum functions primarily to: a) Provide structural support
b) Store calcium ions
c) Produce ATP
d) Connect muscle fibers

Answer
b) Store calcium ions

The sarcolemma is the: a) Endomysium surrounding muscle fibers
b) Membrane surrounding each muscle fiber
c) Layer of connective tissue around fascicles
d) Network of myofibrils

Answer
b) Membrane surrounding each muscle fiber

Muscle fibers are supplied with blood by: a) Tendons
b) Connective tissue sheaths
c) Blood vessels
d) Nerves

Answer
c) Blood vessels

The T-tubules (transverse tubules) are involved in: a) Storage of calcium
b) Conduction of electrical impulses
c) Synthesis of proteins
d) Providing structural support

Answer
b) Conduction of electrical impulses

The primary role of myosin in muscle contraction is: a) Binding to actin
b) Providing energy
c) Storing calcium
d) Facilitating muscle growth

Answer
a) Binding to actin

The thin filaments in a muscle fiber are composed mainly of: a) Actin
b) Myosin
c) Tropomyosin
d) Troponin

Answer
a) Actin

The thick filaments in a muscle fiber are composed mainly of: a) Actin
b) Myosin
c) Tropomyosin
d) Troponin

Answer
b) Myosin

The I-band in a sarcomere contains: a) Only myosin filaments
b) Only actin filaments
c) Both actin and myosin filaments
d) Only tropomyosin

Answer
b) Only actin filaments

The A-band in a sarcomere is: a) The region of overlap between actin and myosin
b) The lighter band in a striated muscle
c) The space between two Z-lines
d) The center of a sarcomere

Answer
a) The region of overlap between actin and myosin

The primary role of the Z-line is to: a) Anchor myosin filaments
b) Anchor actin filaments
c) Regulate calcium release
d) Provide energy

Answer
b) Anchor actin filaments

The function of the T-tubules is to: a) Store calcium
b) Facilitate the transmission of electrical impulses
c) Connect actin and myosin
d) Provide energy for contraction

Answer
b) Facilitate the transmission of electrical impulses

The sliding filament theory of muscle contraction was proposed by: a) Huxley
b) Harvey
c) Hooke
d) Lister

Answer
a) Huxley

Skeletal muscle fibers are composed of smaller units called: a) Fascicles
b) Myofibrils
c) Sarcomeres
d) Myofilaments

Answer
b) Myofibrils

The structure responsible for the release of calcium ions during muscle contraction is the: a) Sarcoplasmic reticulum
b) Endoplasmic reticulum
c) Golgi apparatus
d) Mitochondria

Answer
a) Sarcoplasmic reticulum

During muscle contraction, the distance between Z-lines: a) Increases
b) Decreases
c) Remains the same
d) Disappears

Answer
b) Decreases

The contractile proteins in muscle fibers are: a) Actin and myosin
b) Collagen and elastin
c) Tropomyosin and troponin
d) Keratin and actin

Answer
a) Actin and myosin

The role of tropomyosin in muscle contraction is to: a) Block the binding sites on actin
b) Facilitate the binding of myosin to actin
c) Store calcium ions
d) Provide energy

Answer
a) Block the binding sites on actin

The primary function of troponin in muscle contraction is to: a) Bind to calcium ions
b) Store energy
c) Block actin sites
d) Anchor actin filaments

Answer
a) Bind to calcium ions

The dark band in striated muscle fibers is called the: a) I-band
b) A-band
c) H-zone
d) Z-line

Answer
b) A-band

Muscle fibers are arranged into bundles called: a) Myofibrils
b) Fascicles
c) Sarcomeres
d) Myofilaments

Answer
b) Fascicles

The area of a sarcomere where only myosin filaments are present is the: a) I-band
b) Z-line
c) A-band
d) H-zone

Answer
d) H-zone

The energy required for muscle contraction is provided by: a) ATP
b) Calcium ions
c) Sodium ions
d) Potassium ions

Answer
a) ATP

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