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Skeletal Muscles MDCAT MCQs with Answers

Types Of Muscles MDCAT MCQs

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

Skeletal muscles are primarily responsible for: a) Blood circulation
b) Body movement
c) Hormone secretion
d) Nerve conduction

Answer
b) Body movement

The basic unit of a skeletal muscle is the: a) Myofibril
b) Sarcomere
c) Neuron
d) Mitochondria

Answer
b) Sarcomere

Skeletal muscles are controlled by the: a) Endocrine system
b) Autonomic nervous system
c) Somatic nervous system
d) Digestive system

Answer
c) Somatic nervous system

The connective tissue covering that surrounds an entire skeletal muscle is called: a) Endomysium
b) Perimysium
c) Epimysium
d) Sarcomere

Answer
c) Epimysium

The functional unit of contraction in skeletal muscles is: a) Myosin
b) Sarcomere
c) Fascicle
d) Perimysium

Answer
b) Sarcomere

Which of the following proteins are involved in skeletal muscle contraction? a) Actin and myosin
b) Collagen and elastin
c) Hemoglobin and keratin
d) Tropomyosin and fibrinogen

Answer
a) Actin and myosin

Skeletal muscle fibers are: a) Branched
b) Striated
c) Smooth
d) Non-striated

Answer
b) Striated

The thick filament in skeletal muscles is: a) Actin
b) Tropomyosin
c) Myosin
d) Troponin

Answer
c) Myosin

Skeletal muscles contract in response to: a) Hormones
b) Neural impulses
c) Blood flow
d) Chemical stimuli

Answer
b) Neural impulses

The neurotransmitter involved in skeletal muscle contraction is: a) Dopamine
b) Serotonin
c) Acetylcholine
d) Norepinephrine

Answer
c) Acetylcholine

Which type of muscle exhibits voluntary control? a) Cardiac muscle
b) Smooth muscle
c) Skeletal muscle
d) All of the above

Answer
c) Skeletal muscle

The attachment of a skeletal muscle to a stationary bone is called: a) Insertion
b) Origin
c) Tendon
d) Ligament

Answer
b) Origin

Which ion is essential for skeletal muscle contraction? a) Sodium
b) Potassium
c) Calcium
d) Magnesium

Answer
c) Calcium

The sliding filament theory explains: a) Muscle relaxation
b) Muscle contraction
c) Muscle fatigue
d) Muscle development

Answer
b) Muscle contraction

Skeletal muscles are attached to bones via: a) Ligaments
b) Cartilage
c) Tendons
d) Periosteum

Answer
c) Tendons

The energy source used for skeletal muscle contraction is: a) Glucose
b) ATP
c) Fatty acids
d) Glycogen

Answer
b) ATP

The sarcoplasmic reticulum in skeletal muscle stores: a) Sodium
b) Potassium
c) Calcium
d) ATP

Answer
c) Calcium

The dark band in a skeletal muscle fiber is due to: a) Actin filaments
b) Myosin filaments
c) Tropomyosin
d) Z-line

Answer
b) Myosin filaments

Skeletal muscle fibers are: a) Uninucleated
b) Multinucleated
c) Binucleated
d) None of the above

Answer
b) Multinucleated

The Z-line in a skeletal muscle sarcomere marks: a) The start of a myofibril
b) The boundary of a sarcomere
c) The location of the motor neuron
d) The attachment of thick filaments

Answer
b) The boundary of a sarcomere

Muscle fatigue occurs when: a) Calcium levels increase
b) ATP is depleted
c) Nerve impulses increase
d) Glycogen is stored

Answer
b) ATP is depleted

The protein that blocks myosin-binding sites on actin during muscle relaxation is: a) Troponin
b) Tropomyosin
c) Myoglobin
d) Actinin

Answer
b) Tropomyosin

The point where a motor neuron stimulates a skeletal muscle fiber is called: a) Motor end plate
b) Sarcolemma
c) Neuromuscular junction
d) Synaptic cleft

Answer
c) Neuromuscular junction

The primary function of skeletal muscles is: a) Production of heat
b) Movement of the skeleton
c) Protection of internal organs
d) All of the above

Answer
d) All of the above

Skeletal muscle contraction begins when: a) Myosin binds to actin
b) Calcium ions are released from the sarcoplasmic reticulum
c) Acetylcholine binds to receptors on the sarcolemma
d) ATP is synthesized

Answer
b) Calcium ions are released from the sarcoplasmic reticulum

Skeletal muscle cells are also known as: a) Myofibrils
b) Myoblasts
c) Muscle fibers
d) Fascicles

Answer
c) Muscle fibers

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

Answer
b) Sarcomere

The protein that binds calcium in skeletal muscle contraction is: a) Troponin
b) Tropomyosin
c) Actin
d) Myosin

Answer
a) Troponin

Skeletal muscle contraction is regulated by: a) Endocrine system
b) Nervous system
c) Circulatory system
d) Digestive system

Answer
b) Nervous system

The release of calcium from the sarcoplasmic reticulum triggers: a) Muscle contraction
b) Muscle relaxation
c) Nerve impulse
d) Muscle atrophy

Answer
a) Muscle contraction

During skeletal muscle contraction, the I-band: a) Increases in length
b) Decreases in length
c) Remains the same
d) Disappears completely

Answer
b) Decreases in length

Skeletal muscle fibers are categorized as: a) Uninucleated
b) Multinucleated
c) Binucleated
d) None of the above

Answer
b) Multinucleated

The role of ATP in muscle contraction is to: a) Break down actin
b) Provide energy for the power stroke
c) Attach myosin to actin
d) Store calcium

Answer
b) Provide energy for the power stroke

The thick filament of the skeletal muscle sarcomere is made of: a) Actin
b) Myosin
c) Tropomyosin
d) Troponin

Answer
b) Myosin

During muscle contraction, the length of which region remains unchanged? a) A-band
b) I-band
c) H-zone
d) Z-line

Answer
a) A-band

The enzyme that breaks down acetylcholine at the neuromuscular junction is: a) Acetylcholinesterase
b) Myosin kinase
c) Troponinase
d) Actinase

Answer
a) Acetylcholinesterase

Skeletal muscles maintain posture through: a) Voluntary contraction
b) Muscle tone
c) Muscle fatigue
d) Involuntary contraction

Answer
b) Muscle tone

Muscle soreness after intense exercise is due to: a) Calcium buildup
b) Lactic acid accumulation
c) ATP depletion
d) Protein breakdown

Answer
b) Lactic acid accumulation

The T-tubules in skeletal muscle fibers are involved in: a) Storing calcium
b) Propagating action potentials
c) Synthesizing ATP
d) Muscle relaxation

Answer
b) Propagating action potentials

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