How the Muscular and Nervous Systems Work Together

What is the role of acetylcholine in muscle contraction?

• It triggers an action potential in the muscle fiber.

• It breaks down muscle fibers.

• It inhibits nerve impulses.

• It acts as a muscle relaxant.

Which part of the brain is involved in refining movement, balance, and muscle coordination?

• Cerebellum

• Motor cortex

• Basal ganglia

• Spinal cord

What is the primary difference between reflexes and voluntary movements?

• Reflexes are involuntary and rapid, while voluntary movements are planned and conscious.

• Reflexes require conscious planning, while voluntary movements are automatic.

• Reflexes involve the cerebellum, while voluntary movements bypass the brain.

• Reflexes are slower than voluntary movements.

What condition did Eva suffer from that affected her muscle function?

• Pinched nerve

• Multiple sclerosis

• ALS (Amyotrophic Lateral Sclerosis)

• Peripheral neuropathy

What happens at the neuromuscular junction during muscle contraction?

• Acetylcholine is released and binds to receptors on the muscle membrane.

• Calcium ions are absorbed by the muscle fiber.

• The sarcoplasmic reticulum breaks down.

• Actin and myosin filaments detach.

Why did the pinched nerve reduce Eva’s grip strength?

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What does Eva’s recovery illustrate about the neuromuscular relationship?

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The release of which neurotransmitter at the neuromuscular junction initiates muscle contraction?

• Dopamine

• Serotonin

• Acetylcholine

• Glutamate

A reflex arc typically bypasses:

• The spinal cord

• Motor neurons

• Higher brain centers for faster response

• Sensory receptors

Match the terms to their descriptions

• Acetylcholinesterase

• Condition involving nerve damage outside the brain and spinal cord

• Voluntary Movement

• Intentional muscle action initiated by the brain

• Motor Neuron

• Location where motor neurons release neurotransmitter to muscle fiber

• Peripheral Neuropathy

• Enzyme that breaks down acetylcholine

• Neuromuscular Junction

• Signal conductor carrying impulses to muscle fibers