Question 1

A patient presents with chronic fatigue and pallor. Laboratory tests reveal a low hematocrit and microcytic, hypochromic erythrocytes. Which of the following best explains the underlying mechanism of this patient's anemia?

Accepted Answer

Defective hemoglobin synthesis due to iron deficiency

Question 2

Which of the following best describes the role of Vitamin K in the coagulation cascade?

Accepted Answer

It is required for the synthesis of several clotting factors in the liver

Question 3

A person with type AB+ blood can safely receive packed red blood cells from which of the following donors?

Accepted Answer

Type AB-

Question 4

Which of the following equations correctly represents the calculation of mean arterial pressure (MAP)?

Accepted Answer

$$MAP = CO 	imes R$$

Question 5

During inspiration, which of the following best explains why air flows into the lungs?

Accepted Answer

Boyle's law dictates that increasing thoracic volume decreases intrapulmonary pressure below atmospheric pressure

Question 6

A patient is exposed to carbon monoxide (CO). Which of the following best explains why oxygen delivery to tissues is impaired?

Accepted Answer

CO binds to hemoglobin with a higher affinity than oxygen, reducing available binding sites

Question 7

Which of the following best describes the effect of increased sympathetic nervous system (SNS) activity on the heart?

Accepted Answer

Increased heart rate and contractility via beta-1 adrenergic receptors

Question 8

Which of the following best explains why edema may develop in a patient with right-sided heart failure?

Accepted Answer

Increased hydrostatic pressure in systemic capillaries causes fluid to move into the interstitial space

Question 9

Which of the following best describes the function of surfactant in the alveoli?

Accepted Answer

Decreases surface tension, increasing lung compliance and preventing alveolar collapse

Question 10

A patient with a restrictive lung disease is most likely to have which of the following spirometry findings?

Accepted Answer

Decreased forced vital capacity (FVC) with a normal or increased FEV1/FVC ratio

Question 11

Which of the following best describes the role of carbonic anhydrase in gas transport?

Accepted Answer

It catalyzes the conversion of carbon dioxide and water to carbonic acid in erythrocytes

Question 12

Which of the following best explains the difference between pacemaker cells and contractile cells in the heart?

Accepted Answer

Pacemaker cells generate spontaneous action potentials due to unstable resting membrane potentials

Question 13

A patient receives an injection of anti-Rh antibodies after childbirth. This is an example of which type of immunity?

Accepted Answer

Passive, artificially acquired immunity

Question 14

Which of the following best describes the function of complement proteins in the immune response?

Accepted Answer

They form membrane attack complexes that lyse pathogen membranes

Question 15

Which of the following best explains the effect of alpha-adrenergic receptor activation on blood vessels?

Accepted Answer

Vasoconstriction of most blood vessels, increasing resistance

Question 16

Which of the following best describes the role of bile in digestion?

Accepted Answer

It emulsifies lipids, increasing their surface area for pancreatic lipase action

Question 17

A patient with a bleeding disorder is found to have normal platelet count but prolonged clotting time. Which of the following is most likely deficient?

Accepted Answer

Fibrinogen

Question 18

Which of the following best describes the function of villi and lacteals in the small intestine?

Accepted Answer

Villi increase surface area for absorption; lacteals absorb dietary fats

Question 19

Which of the following best explains the effect of hyperventilation on blood pH?

Accepted Answer

It decreases CO2 levels, causing respiratory alkalosis

Question 20

Which of the following hormones stimulates the release of bile from the gallbladder and pancreatic enzymes into the duodenum?

Accepted Answer

Cholecystokinin (CCK)

Comprehensive Study Notes: Blood, Cardiovascular, Respiratory, Immune, and Digestive Systems

Study Guide - Practice Questions

Study Guide - Flashcards