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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
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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
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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
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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
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Question 5: The muscle that separates chest cavity and abdominal cavity is the:
Biceps
Triceps
Diaphragm
Rectus femoris
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Question 6: The ability of a muscle to return to its original shape after contraction is called:
Respiration
Filtration
Emulsification
Elasticity
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Question 7: Muscles help maintain posture mainly by:
Forming urine
Filtering blood
Producing bile
Continuous slight contractions
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Question 8: Which is an example of cardiac muscle action?
Writing
Chewing
Beating of heart
Bending of arm
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Question 9: In muscles, the chemical change that provides energy during aerobic respiration mainly uses:
Carbon dioxide
Oxygen
Nitrogen
Helium
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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?
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Question 11: Which is NOT a function of muscles?
Movement
Maintaining posture
Producing RBCs
Helping in breathing
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Question 12: The strongest muscle group in the human body (basic level) is often considered the muscles of:
Jaw
Iris
Appendix
Ear lobe
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Question 13: The involuntary muscles of the iris control:
Urine storage
Digestion
Pupil size
Blood clotting
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Question 14: Which feature helps skeletal muscles move bones efficiently?
Attachment at joints via tendons
Presence of alveoli
Presence of villi
Presence of nephrons
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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
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Question 16: If a motor nerve supplying a muscle is damaged, the muscle may:
Produce more bile
Make urine
Absorb nutrients
Not contract properly
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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
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Question 18: A muscle strain most commonly involves:
Damage to villi
Damage to alveoli
Overstretching or tearing of muscle fibers
Break in bone
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Question 19: Which of these is an example of a muscle that works without rest throughout life?
Biceps
Calf muscle
Triceps
Cardiac muscle
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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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