Question 1

Which type of cell communication involves the release of signals that affect only nearby cells, and is crucial for local tissue responses such as inflammation?

Accepted Answer

Paracrine communication

Question 2

A patient is given a steroid hormone that easily crosses the cell membrane. Which type of receptor will this hormone most likely bind to?

Accepted Answer

Intracellular receptor

Question 3

Which hormone is released from the posterior pituitary and is responsible for decreasing urine output by signaling the kidneys to conserve water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 4

A patient with a deficiency in which hormone would most likely experience reduced ability to handle stress due to impaired sympathetic response?

Accepted Answer

Cortisol

Question 5

Which of the following best describes the function of neutrophils?

Accepted Answer

They are the first to attack bacteria and act as phagocytes.

Question 6

Which vessel layer is primarily responsible for vasodilation and vasoconstriction, and is thicker in arteries than in veins?

Accepted Answer

Tunica media

Question 7

A blood vessel is observed to have a large lumen and a thin tunica media. Which type of vessel is this most likely to be?

Accepted Answer

Vein

Question 8

Which type of capillary is found in the liver and allows for the passage of proteins and cells due to its large fenestrations and discontinuous basement membrane?

Accepted Answer

Sinusoid

Question 9

In fetal circulation, which vessel carries oxygenated blood from the placenta to the fetus?

Accepted Answer

Umbilical vein

Question 10

Which of the following is the correct sequence of electrical impulse conduction through the heart, starting from the pacemaker?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 11

A patient has a mutation that prevents the formation of intercalated discs in cardiac muscle. Which of the following would most likely be impaired?

Accepted Answer

Transmission of action potentials between cardiac cells

Question 12

Which hormone is released from the anterior pituitary and stimulates the thyroid gland to regulate metabolism?

Accepted Answer

Thyroid stimulating hormone (TSH)

Question 13

Which of the following best describes the function of basophils?

Accepted Answer

They release histamine and heparin, contributing to inflammation and preventing clotting.

Question 14

Which of the following is a function of the hepatic portal system?

Accepted Answer

It filters nutrient-rich blood from the digestive organs before it enters the systemic circulation.

Question 15

Which of the following white blood cells is most abundant and is the first to respond to bacterial infection?

Accepted Answer

Neutrophil

Question 16

Which of the following is a characteristic of red blood cells (erythrocytes)?

Accepted Answer

They are biconcave and lack a nucleus.

Question 17

A patient with a deficiency in which hormone would most likely have difficulty producing milk after childbirth?

Accepted Answer

Prolactin

Question 18

Which of the following best describes the role of the Circle of Willis?

Accepted Answer

It provides collateral circulation to the brain.

Question 19

Which of the following is true regarding the direction of blood flow in the heart?

Accepted Answer

Blood flows from the right atrium to the right ventricle, then to the pulmonary artery.

Question 20

Which of the following best describes the function of lymphocytes?

Accepted Answer

They are involved in adaptive immunity and can differentiate into T cells, B cells, or NK cells.

Cell Communication, Endocrine System, Blood, and Cardiovascular System Study Notes

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