Q: Which equation correctly represents the sliding filament theory of muscle contraction?

$$ \text{Actin} + \text{Myosin} + \text{ATP} \rightarrow \text{Cross-bridge formation} \rightarrow \text{Muscle contraction} $$

Q: Which of the following is a correct pathway for the transmission of a nerve impulse from a sensory receptor to the brain?

$$ \text{Sensory receptor} \rightarrow \text{Sensory neuron} \rightarrow \text{Spinal cord} \rightarrow \text{Brain} $$

Question 1

Which of the following best describes the function of the neuromuscular junction?

Accepted Answer

It is the site where a motor neuron communicates with a muscle fiber to initiate muscle contraction.

Question 2

A patient is unable to perform fine motor movements with their hand. Which part of the nervous system is most likely affected?

Accepted Answer

The somatic motor division of the peripheral nervous system

Question 3

Which of the following best explains the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions involve a change in muscle length, while isometric contractions do not change muscle length.

Question 4

During a marathon, a runner experiences muscle fatigue. Which of the following is the most likely cause?

Accepted Answer

Depletion of glycogen stores and accumulation of lactic acid in muscle fibers

Question 5

Which equation correctly represents the sliding filament theory of muscle contraction?

Accepted Answer

$$ 	ext{Actin} + 	ext{Myosin} + 	ext{ATP} ightarrow 	ext{Cross-bridge formation} ightarrow 	ext{Muscle contraction} $$

Question 6

A person suffers a spinal cord injury at the level of the cervical vertebrae. Which of the following functions is most likely to be impaired?

Accepted Answer

Voluntary movement of the upper and lower limbs

Question 7

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of certain substances from the blood into the brain tissue.

Question 8

Which of the following is a correct pathway for the transmission of a nerve impulse from a sensory receptor to the brain?

Accepted Answer

$$ 	ext{Sensory receptor} ightarrow 	ext{Sensory neuron} ightarrow 	ext{Spinal cord} ightarrow 	ext{Brain} $$

Question 9

A patient presents with loss of pain and temperature sensation on the right side of the body and loss of fine touch and proprioception on the left. Which spinal cord tract is most likely damaged?

Accepted Answer

The right lateral spinothalamic tract

Question 10

Which of the following best describes the difference between gray matter and white matter in the central nervous system?

Accepted Answer

Gray matter contains neuron cell bodies, while white matter contains myelinated axons.

Question 11

Which of the following correctly lists the sequence of events in the generation of an action potential in a neuron?

Accepted Answer

$$ 	ext{Resting potential} ightarrow 	ext{Depolarization} ightarrow 	ext{Repolarization} ightarrow 	ext{Hyperpolarization} $$

Question 12

A patient is diagnosed with myasthenia gravis, an autoimmune disorder affecting the neuromuscular junction. Which neurotransmitter is most likely affected?

Accepted Answer

Acetylcholine

Question 13

Which of the following best explains the function of the organ of Corti in the ear?

Accepted Answer

It contains hair cells that transduce sound vibrations into nerve impulses.

Question 14

Which of the following equations best represents the relationship between frequency ($$f$$), wavelength ($$\lambda$$), and speed of sound ($$v) in $$the context of hearing?

Accepted Answer

$$ v = f 	imes \lambda $$

Question 15

A person is unable to distinguish between salty and sweet tastes. Which cranial nerves are most likely involved in this deficit?

Accepted Answer

Facial (VII) and glossopharyngeal (IX) nerves

Question 16

Which of the following best describes the function of rods in the retina?

Accepted Answer

They are responsible for vision in low light conditions and do not detect color.

Question 17

A patient presents with conductive deafness. Which of the following is the most likely cause?

Accepted Answer

Damage to the ossicles in the middle ear

Question 18

Which of the following best explains how the equilibrium organs help maintain balance?

Accepted Answer

They detect changes in head position and movement, sending signals to the brain to coordinate posture and movement.

Question 19

Which of the following is a correct sequence for the visual pathway from the retina to the brain?

Accepted Answer

$$ 	ext{Retina} ightarrow 	ext{Optic nerve} ightarrow 	ext{Optic chiasm} ightarrow 	ext{Optic tract} ightarrow 	ext{Thalamus} ightarrow 	ext{Visual cortex} $$

Anatomy & Physiology Study Guide: Muscular, Nervous, and Sensory Systems

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