Question 1

A patient presents with yellowing of the skin and sclera (jaundice) following a severe bruise. Which of the following best explains the physiological process leading to jaundice in this scenario?

Accepted Answer

Excessive breakdown of hemoglobin leads to accumulation of unconjugated bilirubin, which is not efficiently excreted by the liver.

Question 2

Which of the following best describes the effect of increased afterload on stroke volume (SV) and why?

Accepted Answer

Increased afterload raises end-systolic volume (ESV), thereby decreasing stroke volume because the ventricle must work harder to overcome higher arterial pressure.

Question 3

A patient with chronic kidney disease is found to have a low hematocrit and low reticulocyte count. Which of the following best explains the underlying cause?

Accepted Answer

Decreased erythropoietin (EPO) production by the kidneys leads to reduced stimulation of erythropoiesis in the bone marrow.

Question 4

Which of the following equations correctly represents the relationship between blood flow (F), pressure (P), and resistance (R)?

Accepted Answer

$$F = \frac{P}{R}$$

Question 5

A patient is given a plasma expander after significant blood loss. What is the primary purpose of a plasma expander in this context?

Accepted Answer

To increase plasma volume and maintain blood pressure until blood transfusion is available.

Question 6

Which of the following best describes the role of albumin in plasma?

Accepted Answer

Maintains osmotic pressure and transports substances such as hormones and drugs.

Question 7

A patient with a history of deep vein thrombosis (DVT) is prescribed warfarin. What is the mechanism of action of this medication?

Accepted Answer

It inhibits vitamin K-dependent synthesis of clotting factors, reducing the ability to form fibrin clots.

Question 8

Which of the following best explains why veins have valves?

Accepted Answer

To prevent backflow of blood and ensure unidirectional flow toward the heart, especially in the limbs.

Question 9

Which of the following is the correct formula for calculating mean arterial pressure (MAP)?

Accepted Answer

$$MAP = DBP + \frac{1}{3}(SBP - DBP)$$

Question 10

A patient with a genetic deficiency in clotting factor VIII presents with frequent bleeding episodes. What is the most likely diagnosis and inheritance pattern?

Accepted Answer

Hemophilia A; X-linked recessive inheritance

Question 11

During the cardiac cycle, what event is responsible for the first heart sound ('lub')?

Accepted Answer

Closure of the atrioventricular (AV) valves at the beginning of ventricular systole

Question 12

Which of the following best describes the effect of hyperkalemia on cardiac function?

Accepted Answer

It decreases the resting membrane potential, leading to impaired depolarization and potentially fatal arrhythmias.

Question 13

Which of the following is a primary function of the lymphocyte subtype known as cytotoxic T cells?

Accepted Answer

Directly destroy virus-infected and cancerous cells.

Question 14

A patient is diagnosed with atherosclerosis. Which of the following best describes the initial step in the development of this condition?

Accepted Answer

Endothelial injury leads to accumulation of lipids and inflammatory cells in the arterial wall.

Question 15

Which of the following best explains why the plateau phase in cardiac contractile cells is important?

Accepted Answer

It prolongs depolarization, preventing tetanus and allowing time for the heart chambers to refill.

Question 16

Which of the following is the most permeable type of capillary, and where is it typically found?

Accepted Answer

Sinusoidal capillaries; found in the liver and bone marrow

Question 17

Which of the following best describes the effect of the baroreceptor reflex in response to a sudden drop in blood pressure?

Accepted Answer

It increases sympathetic output, causing vasoconstriction and increased heart rate to restore blood pressure.

Question 18

A patient with a low platelet count (thrombocytopenia) is scheduled for surgery. Why is this a concern?

Accepted Answer

There is an increased risk of excessive bleeding due to impaired clot formation.

Question 19

Which of the following best describes the function of the pericardial fluid?

Accepted Answer

It reduces friction between the heart and pericardial sac during cardiac contractions.

Comprehensive Study Guide: Blood, Heart, and Blood Vessels (Chapters 17, 18, 19)

Study Guide - Practice Questions

Study Guide - Flashcards