Muscular System
Biology ⇒ Human Biology
Muscular System starts at 6 and continues till grade 12.
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See sample questions for grade 12
Describe the process of muscle relaxation after contraction.
Describe the role of antagonistic muscle pairs in movement.
Describe the role of troponin and tropomyosin in muscle contraction.
Describe the sliding filament theory of muscle contraction.
A patient is unable to extend their knee after an injury. Which muscle is most likely affected?
(1) Biceps femoris
(2) Quadriceps femoris
(3) Gastrocnemius
(4) Sartorius
A person is experiencing muscle cramps after intense exercise. Which of the following is a likely cause?
(1) Excess ATP
(2) Depletion of calcium ions
(3) Accumulation of lactic acid
(4) Increased oxygen supply
A patient is diagnosed with myasthenia gravis, an autoimmune disorder affecting the neuromuscular junction. Describe the physiological mechanism by which this disease impairs muscle contraction.
A sprinter and a marathon runner have different muscle fiber compositions. Explain how the proportion of fast-twitch and slow-twitch fibers affects their athletic performance.
A patient is unable to extend their knee after an injury. Which muscle is most likely affected?
(1) Biceps femoris
(2) Quadriceps femoris
(3) Gastrocnemius
(4) Sartorius
A person is experiencing muscle cramps after intense exercise. Which of the following is a likely cause?
(1) Excess ATP
(2) Depletion of calcium ions
(3) Accumulation of lactic acid
(4) Increased oxygen supply
Which ion is essential for the initiation of muscle contraction?
(1) Sodium
(2) Potassium
(3) Calcium
(4) Magnesium
Which of the following best describes a motor unit?
(1) A single muscle fiber
(2) A group of muscle fibers innervated by a single motor neuron
(3) All the muscles in a limb
(4) A single motor neuron only
Fill in the blank: The __________ band of the sarcomere contains only actin filaments.
Fill in the blank: The __________ is the connective tissue layer that surrounds an entire muscle.
Fill in the blank: The __________ is the largest muscle in the human body.
Fill in the blank: The __________ is the main muscle involved in breathing.
True or False: All muscle contractions require nervous stimulation.
True or False: All skeletal muscles are attached to bones.
True or False: Cardiac muscle is under voluntary control.
True or False: Muscle fatigue is primarily caused by the accumulation of lactic acid.
