,1. What is the primary function of the muscular system?
a. To regulate body temperature
b. To provide support and movement for the body
c. To release hormones into the bloodstream
d. To filter waste products from the blood
Answer: b. To provide support and movement for the body
Rationale: The muscular system is responsible for movement and stability
in the body, allowing us to perform daily activities such as walking,
running, and lifting.
2. Which statement accurately describes the difference between skeletal,
cardiac, and smooth muscle?
a. Skeletal muscle is voluntary, cardiac muscle is involuntary, and smooth
muscle is both voluntary and involuntary
b. Skeletal muscle is involuntary, cardiac muscle is voluntary, and smooth
muscle is both voluntary and involuntary
c. Skeletal muscle is voluntary, cardiac muscle is involuntary, and smooth
muscle is involuntary
d. Skeletal muscle is involuntary, cardiac muscle is voluntary, and smooth
muscle is voluntary
Answer: c. Skeletal muscle is voluntary, cardiac muscle is involuntary,
and smooth muscle is involuntary
Rationale: Skeletal muscles are under voluntary control, meaning we can
consciously control their movements. Cardiac muscle is involuntary, as it
contracts without conscious control. Smooth muscle is also involuntary,
found in organs like the intestines and blood vessels.
3. What is the purpose of the neuromuscular junction?
a. To transmit electrical impulses from the brain to the muscles
b. To release neurotransmitters that stimulate muscle contractions
c. To regulate hormone production in the body
d. To filter waste products from the blood in the muscles
Answer: b. To release neurotransmitters that stimulate muscle contractions
Rationale: The neuromuscular junction is the point of communication
, between a motor neuron and a muscle fiber. Neurotransmitters are
released here to stimulate muscle contractions.
4. Which neurotransmitter is responsible for initiating muscle contractions
at the neuromuscular junction?
a. Acetylcholine
b. Dopamine
c. Serotonin
d. Norepinephrine
Answer: a. Acetylcholine
Rationale: Acetylcholine is the neurotransmitter released at the
neuromuscular junction that triggers muscle contractions by binding to
receptors on the muscle fiber.
5. How does the skeletal system work together with the muscular system
to produce movement?
a. Bones contract and relax to move the muscles
b. Muscles pull on bones to produce movement at the joints
c. Muscles store and release energy to propel the body forward
d. Bones provide support and protect the muscles from injury
Answer: b. Muscles pull on bones to produce movement at the joints
Rationale: Muscles attach to bones via tendons and contract to pull on the
bones, causing movement at the joints. The bones act as levers to amplify
the force generated by the muscles.
6. What role do motor neurons play in the nervous system's control of
muscle movement?
a. Motor neurons transmit sensory information from the muscles to the
brain
b. Motor neurons carry messages from the brain to the muscles, initiating
movement
c. Motor neurons regulate hormone production in the muscles
d. Motor neurons filter waste products from the blood in the muscles
Answer: b. Motor neurons carry messages from the brain to the muscles,
initiating movement
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