Frequently Asked MCQ quiz on Muscles – MCQ Quiz for Competitive Exam Preparation – These questions given will be useful for competitive exams preparation. We will be updating more mcq regularly, please follow our website regularly.

Which type of muscle tissue is under voluntary control?

A) Cardiac muscle

B) Smooth muscle

C) Skeletal muscle

D) Involuntary muscle

Answer: C) Skeletal muscle

What is the functional unit of a skeletal muscle called?

A) Myofibril

B) Sarcomere

C) Myosin filament

D) Actin filament

Answer: B) Sarcomere

Which of the following is NOT a function of skeletal muscles?

A) Producing body heat

B) Providing support and protection to internal organs

C) Facilitating movement of the body

D) Stabilizing joints

Answer: B) Providing support and protection to internal organs

Which neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?

A) Serotonin

B) Dopamine

C) Acetylcholine

D) Norepinephrine

Answer: C) Acetylcholine

Which type of muscle tissue is found in the walls of hollow organs such as the stomach and intestines?

A) Skeletal muscle

B) Cardiac muscle

C) Smooth muscle

D) Striated muscle

Answer: C) Smooth muscle

What is the primary energy source for muscle contraction?

A) Glucose

B) ATP (Adenosine triphosphate)

C) Oxygen

D) Carbon dioxide

Answer: B) ATP (Adenosine triphosphate)

Which protein serves as the molecular motor for muscle contraction?

A) Actin

B) Myosin

C) Troponin

D) Tropomyosin

Answer: B) Myosin

Which of the following muscle types is characterized by its branching, striated appearance?

A) Skeletal muscle

B) Cardiac muscle

C) Smooth muscle

D) Involuntary muscle

Answer: B) Cardiac muscle

Which part of the sarcomere contains thin filaments primarily composed of actin?

A) A band

B) I band

C) H zone

D) Z line

Answer: B) I band

What is the functional role of the sarcoplasmic reticulum in muscle contraction?

A) Synthesizing ATP

B) Storing calcium ions

C) Producing actin filaments

D) Transmitting action potentials

Answer: B) Storing calcium ions

Which of the following is responsible for the striated appearance of skeletal and cardiac muscles?

A) Actin filaments

B) Myosin filaments

C) Sarcomeres

D) T-tubules

Answer: C) Sarcomeres

What is the role of tropomyosin in muscle contraction?

A) It binds to calcium ions.

B) It prevents the binding of myosin to actin.

C) It activates the motor protein myosin.

D) It regulates the exposure of myosin-binding sites on actin.

Answer: D) It regulates the exposure of myosin-binding sites on actin.

Which neurotransmitter is released by motor neurons at the neuromuscular junction to initiate muscle contraction?

A) Serotonin

B) GABA (gamma-aminobutyric acid)

C) Acetylcholine

D) Dopamine

Answer: C) Acetylcholine

Which of the following muscle types is characterized by its spindle-shaped cells and involuntary control?

A) Skeletal muscle

B) Cardiac muscle

C) Smooth muscle

D) Striated muscle

Answer: C) Smooth muscle

What is the role of the motor end plate in muscle contraction?

A) It stores calcium ions.

B) It generates action potentials.

C) It releases neurotransmitters.

D) It forms junctions with tendons.

Answer: C) It releases neurotransmitters.

What is the term for the functional unit of a muscle fiber?

A) Sarcomere

B) Myofibril

C) Myofilament

D) Myotendinous junction

Answer: A) Sarcomere

Which protein covers the myosin-binding sites on actin molecules in resting muscle?

A) Tropomyosin

B) Troponin

C) Myosin

D) Actin

Answer: A) Tropomyosin

Which type of muscle tissue exhibits autorhythmicity and involuntary control?

A) Skeletal muscle

B) Cardiac muscle

C) Smooth muscle

D) Striated muscle

Answer: B) Cardiac muscle

During muscle contraction, which ion is released from the sarcoplasmic reticulum to trigger the binding of myosin to actin?

A) Sodium ions (Na+)

B) Potassium ions (K+)

C) Calcium ions (Ca2+)

D) Chloride ions (Cl-)

Answer: C) Calcium ions (Ca2+)

What is the functional unit of a myofibril?

A) Sarcomere

B) Myosin filament

C) Actin filament

D) Cross-bridge

Answer: A) Sarcomere

Which protein is responsible for anchoring myofibrils to the sarcolemma and extracellular matrix?

A) Actin

B) Myosin

C) Titin

D) Troponin

Answer: C) Titin

Which of the following statements about fast-twitch muscle fibers is true?

A) They have a high resistance to fatigue.

B) They primarily utilize aerobic metabolism.

C) They are rich in mitochondria.

D) They generate rapid and powerful contractions.

Answer: D) They generate rapid and powerful contractions.

What is the term for the functional junction between a motor neuron and a muscle fiber?

A) Sarcomere

B) Neuromuscular junction

C) Myofibril

D) Myosin-actin junction

Answer: B) Neuromuscular junction

Which type of muscle fiber is primarily responsible for maintaining posture and endurance activities?

A) Slow-twitch (Type I) fibers

B) Fast-twitch oxidative (Type IIa) fibers

C) Fast-twitch glycolytic (Type IIb) fibers

D) Intermediate fibers

Answer: A) Slow-twitch (Type I) fibers

What is the role of creatine phosphate in muscle cells?

A) To provide a direct source of ATP during muscle contraction

B) To buffer pH changes in the muscle tissue

C) To regulate calcium ion concentration in the sarcoplasm

D) To stabilize the sarcomere structure

Answer: A) To provide a direct source of ATP during muscle contraction

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