Muscular System
Biology ⇒ Human Biology
Muscular System starts at 6 and continues till grade 12.
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See sample questions for grade 11
A patient is experiencing muscle weakness due to a lack of acetylcholine receptors at the neuromuscular junction. What is the likely effect on muscle contraction?
Describe the difference between isotonic and isometric muscle contractions.
Describe the main differences between skeletal, cardiac, and smooth muscle tissues.
Describe the role of ATP in muscle contraction.
A patient is experiencing muscle weakness due to a lack of acetylcholine receptors at the neuromuscular junction. What is the likely effect on muscle contraction?
A person is unable to move their arm after a nerve injury. Which part of the muscular system is most likely affected?
(1) Muscle fibers
(2) Tendons
(3) Neuromuscular junction
(4) Ligaments
A patient presents with muscle stiffness and spasms. Laboratory tests reveal a deficiency in the enzyme acetylcholinesterase. Explain how this deficiency affects muscle contraction and relaxation.
A researcher measures the electrical activity of a muscle and observes a sustained contraction with no relaxation. What is this phenomenon called?
(1) Twitch
(2) Tetanus
(3) Summation
(4) Fatigue
A person is unable to move their arm after a nerve injury. Which part of the muscular system is most likely affected?
(1) Muscle fibers
(2) Tendons
(3) Neuromuscular junction
(4) Ligaments
Which ion is essential for the initiation of muscle contraction?
(1) Sodium
(2) Potassium
(3) Calcium
(4) Magnesium
Which muscle is primarily responsible for breathing by contracting and relaxing?
(1) Diaphragm
(2) Deltoid
(3) Pectoralis major
(4) Trapezius
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 group of tendons
Fill in the blank: The __________ is the connective tissue that surrounds an entire muscle.
Fill in the blank: The __________ is the connective tissue that surrounds bundles of muscle fibers (fascicles).
Fill in the blank: The __________ is the connective tissue that surrounds individual muscle fibers.
Fill in the blank: The __________ is the smallest functional unit of a muscle fiber.
True or False: All muscle contractions result in movement of a body part.
True or False: All muscles in the human body are attached to bones.
True or False: ATP is required for both muscle contraction and relaxation.
True or False: Cardiac muscle is under voluntary control.
