Question 1

Which of the following best describes paracrine signaling in the human body?

Accepted Answer

A cell releases a signal that acts on nearby cells within the same tissue.

Question 2

Which of the following is a key difference between endocrine and nervous signaling?

Accepted Answer

Endocrine signaling uses hormones that travel through the bloodstream, while nervous signaling uses electrical impulses and neurotransmitters.

Question 3

Which of the following is NOT a type of direct membrane communication?

Accepted Answer

Autocrine signaling

Question 4

A hydrophilic ligand binds to its receptor on the cell membrane. What is the most likely next step in the signal transduction pathway?

Accepted Answer

The receptor activates a second messenger system inside the cell.

Question 5

Which equation correctly represents the activation of adenylyl cyclase by a G-protein coupled receptor (GPCR) to produce cyclic AMP?

Accepted Answer

$$cAMP = ATP \rightarrow cAMP + PP_i$$

Question 6

Which of the following best explains why feedback mechanisms are important in endocrine regulation?

Accepted Answer

They help maintain homeostasis by adjusting hormone levels in response to physiological changes.

Question 7

A patient has a disorder affecting the hypothalamus. Which of the following physiological effects is most likely to be disrupted?

Accepted Answer

Regulation of body temperature and metabolism

Question 8

Which of the following is a correct sequence of events in the generation of an action potential?

Accepted Answer

Depolarization, repolarization, hyperpolarization

Question 9

Which ion is primarily responsible for the depolarization phase of the action potential in neurons?

Accepted Answer

Sodium ($$Na^+)$$

Question 10

Which of the following best describes the role of Schwann cells in the peripheral nervous system?

Accepted Answer

They produce myelin to insulate axons.

Question 11

Which neurotransmitter is most commonly associated with excitatory synaptic transmission in the central nervous system?

Accepted Answer

Glutamate

Question 12

Which of the following is a correct comparison between sympathetic and parasympathetic nervous system responses?

Accepted Answer

Sympathetic responses increase heart rate, while parasympathetic responses decrease heart rate.

Question 13

Which of the following best describes the function of astrocytes in the central nervous system?

Accepted Answer

They maintain the blood-brain barrier and support neuronal function.

Question 14

Which equation best represents the Nernst equation for calculating the equilibrium potential of an ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Question 15

Which of the following is a function of microglia in the central nervous system?

Accepted Answer

They act as immune cells, removing debris and pathogens.

Question 16

Which of the following best describes the organization of gray matter and white matter in the brain?

Accepted Answer

Gray matter consists of neuron cell bodies and dendrites, while white matter consists of myelinated axons.

Question 17

Which of the following is a correct example of negative feedback in endocrine regulation?

Accepted Answer

High blood glucose stimulates insulin release, which lowers blood glucose and inhibits further insulin secretion.

Question 18

Which of the following best explains the difference between hydrophobic and hydrophilic hormone signaling?

Accepted Answer

Hydrophilic hormones bind to cell surface receptors and activate second messenger systems, while hydrophobic hormones enter the cell and bind to intracellular receptors to affect gene expression.

Question 19

Which of the following is a correct description of the role of the pituitary gland in endocrine signaling?

Accepted Answer

It releases hormones that control other endocrine glands, such as the thyroid and adrenal glands.

Signals, Endocrine System, and Nervous System: Study Notes for Anatomy & Physiology

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