Q: Which equation best represents the relationship between the number of motor units activated and the strength of muscle contraction?

$$F_{total} = n_{units} \times F_{unit}$$

Question 1

Which division of the autonomic nervous system is primarily responsible for the 'fight or freeze' response, and what is its main effect on heart rate?

Accepted Answer

Sympathetic; increases heart rate

Question 2

A patient is experiencing rapid heartbeat and dilated pupils after a stressful event. Which neurotransmitter is most likely elevated in their synapses?

Accepted Answer

Norepinephrine

Question 3

Which of the following best describes the antagonistic relationship between the sympathetic and parasympathetic nervous systems?

Accepted Answer

One system increases organ activity while the other decreases it

Question 4

During muscle contraction, which ion is released from the sarcoplasmic reticulum to initiate the process?

Accepted Answer

Calcium ($$Ca^{2+})$$

Question 5

Which structure is the site of communication between a motor neuron and a skeletal muscle fiber?

Accepted Answer

Neuromuscular junction

Question 6

Botox is used to treat conditions like cerebral palsy and dystonia by interfering with which step of muscle contraction?

Accepted Answer

Release of acetylcholine at the neuromuscular junction

Question 7

Which of the following correctly matches the nervous system division with its primary target tissue?

Accepted Answer

Autonomic nervous system: smooth muscle

Question 8

A motor unit consists of:

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Question 9

Which neurotransmitter is released at the neuromuscular junction to stimulate skeletal muscle contraction?

Accepted Answer

Acetylcholine

Question 10

If a drug blocks the release of acetylcholine at the neuromuscular junction, what is the most likely physiological effect?

Accepted Answer

Paralysis of skeletal muscles

Question 11

Which of the following best explains why skeletal muscle cells are multinucleated?

Accepted Answer

They fuse from multiple precursor cells during development

Question 12

Which layer surrounds individual muscle fibers and is also known as the plasma membrane of the muscle cell?

Accepted Answer

Sarcolemma

Question 13

A patient with strabismus receives Botox injections. What is the mechanism by which Botox alleviates their symptoms?

Accepted Answer

Prevents acetylcholine release, reducing muscle contraction

Question 14

Which of the following pathways correctly describes the flow of information in the somatic nervous system?

Accepted Answer

Spinal cord → motor neuron → skeletal muscle

Question 15

Which of the following is a function of the parasympathetic nervous system?

Accepted Answer

Stimulates digestion and decreases heart rate

Question 16

Which equation best represents the relationship between the number of motor units activated and the strength of muscle contraction?

Accepted Answer

$$F_{total} = n_{units} 	imes F_{unit}$$

Question 17

Which of the following best describes the role of satellite cells in skeletal muscle?

Accepted Answer

They assist in muscle repair and regeneration

Question 18

Which of the following is NOT a target of the autonomic nervous system?

Accepted Answer

Skeletal muscle

Question 19

A person is exposed to a toxin that blocks calcium release from the sarcoplasmic reticulum. What is the most likely effect on muscle contraction?

Accepted Answer

Muscle contraction will be inhibited

Question 20

Which of the following best explains why the autonomic nervous system is essential for maintaining homeostasis?

Accepted Answer

It regulates involuntary functions such as heart rate, digestion, and gland secretion

Autonomic Nervous System and Muscle Physiology Study Notes

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