Here are 20 easy multiple-choice questions (MCQ's) on the muscles, types of muscle, and muscle contraction for Class 12:
1. Skeletal muscles are attached to bones by:
A. Tendons
B. Ligaments
C. Cartilage
D. Joints
Correct option is: A (tendons).
2. The basic functional unit of a skeletal muscle is called a:
Correct option is: B (sarcomere).
3. The connective tissue that surrounds the entire skeletal muscle is called:
A. Epimysium
B. Endomysium
C. Perimysium
D. Tendon
Correct option is: A (epimysium).
4. The contractile proteins found in skeletal muscles are:
Correct option is: A (actin and myosin).
5. The neurotransmitter responsible for transmitting signals from motor neurons to skeletal muscles is:
A. Serotonin
B. Dopamine
C. Acetylcholine
D. Epinephrine
Correct option is: C (acetylcholine).
6. The repeating units along the length of a myofibril are called:
A. Sarcomeres
B. Myofilaments
C. Myofibers
D. Myocytes
Correct option is: A (sarcomeres).
7. The protein that covers the binding sites on actin molecules, preventing myosin from binding, is called:
A. Troponin
B. Tropomyosin
C. Titin
D. Nebulin
Correct option is: B (tropomyosin).
8. The main function of the sarcoplasmic reticulum in muscle cells is to:
A. Store and release calcium ions
B. Synthesize ATP
C. Produce myosin filaments
D. Provide structural support to the
muscle fiber
Correct option is: A (store and release calcium ions).
9. The energy molecule used by skeletal muscles for contraction is:
A. ATP–adenosine triphosphate
B. ADP –adenosine diphosphate
C. AMP –adenosine monophosphate
D. GTP–guanosine triphosphate
Correct option is: A (ATP–adenosine triphosphate)
10. The motor unit consists of:
A. A motor neuron and the muscle
fibers it innervates
B. Actin and myosin filaments
C. Tendons and ligaments
D. Sarcomeres and myofibrils
Correct option is: A (motor neuron and the muscle fibers it innervates).
11. The sliding filament theory explains muscle contraction by:
A. The shortening of actin filaments
B. The shortening of myosin filaments
C. The sliding of actin and myosin filaments past each other
D. The contraction of the sarcoplasmic reticulum
Correct option is: C (The sliding of actin and myosin filaments past each other).
12. The neurotransmitter acetylcholine is released from motor neurons at the:
A. Neuromuscular junction
B. Synapse
C. Myofibril
D. Sarcoplasmic reticulum
Correct option is: A (neuromuscular junction)
13. The H zone of a sarcomere contains:
A. Only myosin filaments
B. Only actin filaments
C. Both actin and myosin filaments
D. Calcium ions
Correct option is: A (only myosin filaments).
14. The A band of a sarcomere contains:
A. Only myosin filaments
B. Only actin filaments
C. Both actin and myosin filaments
D. Troponin and tropomyosin
Correct option is: C (both actin and myosin filaments).
15. The Z line (disc) of a sarcomere is responsible for:
A. Anchoring actin filaments
B. Anchoring myosin filaments
C. Sliding of actin and myosin filaments
D. Calcium ion release
Correct option is: B (anchoring myosin filaments).
16. The thin filaments in a sarcomere are composed mainly of:
A. Actin
B. Myosin
C. Troponin
D. Tropomyosin
Correct option is: A (myosin).
17. The thick filaments in a sarcomere are composed mainly of:
A. Myosin
B. Actin
C. Troponin
D. Tropomyosin
Correct option is: A (myosin).
18. Which of the following is not a function of skeletal muscles?
A. Support and movement
B. Heat production
C. Protection of internal organs
D. Hormone secretion
Correct option is: D (hormone secretion).
19. The muscle that opposes the action of another muscle is called:
A. Antagonistic muscle
B. Synergist
C. Agonist
D. Fixator
Correct option is: A (antagonistic muscle).
20. The muscle responsible for the main action is called:
A. Agonist
B. Synergist
C. Antagonist
D. Fixator
Correct option is: A (agonist).
21. Which type of muscle is responsible for involuntary movements?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Striated muscle
Correct option is: A (smooth muscle).
22. Which muscle is responsible for pumping oxygenated blood to the body?
A. Biceps brachii
B. Diaphragm
C. Heart muscle
D. Quadriceps femoris
Correct option is: C (heart muscle).
23. Which muscle is involved in breathing?
A. Diaphragm
B. Gluteus maximus
C. Trapezius
D. Biceps brachii
Correct option is: A (diaphragm).
24. Which muscle is responsible for pumping blood throughout the body?
A. Quadriceps femoris
B. Hamstring muscles
C. Deltoid
D. Cardiac muscle
Correct option is: D (cardiac muscle).
➡️These questions should provide a basic understanding of the structure of skeletal muscles at the Class 12 level. For more of these types of MCQ's, check out the following blog.
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