Question 1

Which of the following best describes the difference between the sympathetic and parasympathetic divisions of the autonomic nervous system (ANS) in terms of preganglionic and postganglionic neuron characteristics?

Accepted Answer

Sympathetic preganglionic neurons are short and myelinated; parasympathetic preganglionic neurons are long and myelinated.

Question 2

A patient presents with muscle weakness and decreased reflexes. Laboratory tests reveal a deficiency in acetylcholine at the neuromuscular junction. Which type of receptor is most likely affected?

Accepted Answer

Nicotinic receptor

Question 3

Which glial cell is responsible for forming the myelin sheath in the central nervous system (CNS)?

Accepted Answer

Oligodendrocyte

Question 4

During the repolarization phase of an action potential, which ion movement is primarily responsible for returning the membrane potential toward the resting value?

Accepted Answer

Efflux of K\^+

Question 5

Which lobe of the cerebrum is primarily responsible for processing visual information?

Accepted Answer

Occipital lobe

Question 6

A patient with hyperthyroidism is experiencing increased heart rate, weight loss, and anxiety. Which hormone is likely being hypersecreted, and from which gland is it released?

Accepted Answer

Thyroxine (T4) from the thyroid gland

Question 7

Which of the following best describes the process of upregulation in hormone receptors?

Accepted Answer

An increase in the number of receptors in response to low hormone levels

Question 8

Which neurotransmitter is released by postganglionic sympathetic neurons, and what type of receptor does it primarily bind to?

Accepted Answer

Norepinephrine; adrenergic receptor

Question 9

A patient has a tumor compressing the hypothalamic-pituitary stalk. Which of the following is a likely consequence?

Accepted Answer

Disrupted regulation of pituitary hormone release

Question 10

Which glial cell type is responsible for phagocytosis and immune defense in the central nervous system?

Accepted Answer

Microglia

Question 11

Which of the following best describes the sequence of events during an action potential?

Accepted Answer

Depolarization, repolarization, hyperpolarization, return to resting potential

Question 12

Which hormone is released from the posterior pituitary and is responsible for stimulating uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 13

A patient with Addison's disease has low cortisol levels. Which of the following symptoms is most likely to occur due to hyposecretion of cortisol?

Accepted Answer

Hypoglycemia

Question 14

Which neurotransmitter is released by all preganglionic neurons in the autonomic nervous system?

Accepted Answer

Acetylcholine

Question 15

Which of the following is a function of the parietal lobe of the cerebrum?

Accepted Answer

Integrating sensory information such as touch and spatial awareness

Question 16

Which glial cell is found in the peripheral nervous system and is responsible for myelinating axons?

Accepted Answer

Schwann cell

Question 17

A patient is given a drug that blocks muscarinic receptors. Which of the following effects would most likely be observed?

Accepted Answer

Increased heart rate due to inhibition of parasympathetic activity

Question 18

Which hormone is released from the adrenal medulla and is involved in the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 19

Which of the following best explains why unmyelinated axons conduct action potentials more slowly than myelinated axons?

Accepted Answer

Action potentials in unmyelinated axons propagate continuously rather than by saltatory conduction.

Question 20

A patient with a pituitary tumor is found to have elevated levels of growth hormone (GH). Which of the following is a likely consequence of this hypersecretion in an adult?

Accepted Answer

Acromegaly

Comprehensive Guidance on Nervous and Endocrine System Concepts for ANP

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