Science Series 2026 - Biology Human 09

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Question 1: Which change usually occurs in muscles after regular exercise?

They turn into cartilage

They produce more bile

They become stronger and more efficient

They stop contracting

Question 2: Muscle fatigue is mainly due to:

Accumulation of lactic acid and depletion of energy

Formation of urine

More oxygen in blood

Excess bile

Question 3: Which statement about smooth muscles is correct?

They form the lens of eye

They are striated and voluntary

They are found in bones

They are spindle-shaped and involuntary

Question 4: Which statement about skeletal muscles is correct?

They are striated and voluntary

They are non-striated and involuntary

They are found only in stomach

They pump blood

Question 5: The muscle that separates chest cavity and abdominal cavity is the:

Biceps

Triceps

Diaphragm

Rectus femoris

Question 6: The ability of a muscle to return to its original shape after contraction is called:

Respiration

Filtration

Emulsification

Elasticity

Question 7: Muscles help maintain posture mainly by:

Forming urine

Filtering blood

Producing bile

Continuous slight contractions

Question 8: Which is an example of cardiac muscle action?

Writing

Chewing

Beating of heart

Bending of arm

Question 9: In muscles, the chemical change that provides energy during aerobic respiration mainly uses:

Carbon dioxide

Oxygen

Nitrogen

Helium

Question 10: A fast sprint causes breathlessness because muscles require:

No energy

Less oxygen and produce less CO?

Only water

More oxygen and produce more CO?

Question 11: Which is NOT a function of muscles?

Movement

Maintaining posture

Producing RBCs

Helping in breathing

Question 12: The strongest muscle group in the human body (basic level) is often considered the muscles of:

Jaw

Iris

Appendix

Ear lobe

Question 13: The involuntary muscles of the iris control:

Urine storage

Digestion

Pupil size

Blood clotting

Question 14: Which feature helps skeletal muscles move bones efficiently?

Attachment at joints via tendons

Presence of alveoli

Presence of villi

Presence of nephrons

Question 15: Which statement best describes a muscle 'contraction'?

Muscle fibers shorten and pull

Muscle fibers stop using energy

Muscle fibers become liquid

Muscle fibers turn into bone

Question 16: If a motor nerve supplying a muscle is damaged, the muscle may:

Produce more bile

Make urine

Absorb nutrients

Not contract properly

Question 17: Why do athletes warm up before exercise?

To reduce oxygen supply

To increase bone density instantly

To stop breathing

To increase blood flow and reduce injury risk

Question 18: A muscle strain most commonly involves:

Damage to villi

Damage to alveoli

Overstretching or tearing of muscle fibers

Break in bone

Question 19: Which of these is an example of a muscle that works without rest throughout life?

Biceps

Calf muscle

Triceps

Cardiac muscle

Question 20: Smooth muscles in the stomach wall help in:

Churning and mixing food

Pumping blood

Transmitting nerve impulses

Producing urine

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Quizzes » Science Series 2026 - Biology Human 09