Question 1

A patient is admitted with severe chest pain, shortness of breath, and sweating. Laboratory tests confirm death of cardiac muscle tissue. Which of the following best explains the underlying cause of this condition?

Accepted Answer

Complete blockage of a coronary artery resulting in permanent myocardial damage

Question 2

Which of the following best describes the sequence of electrical conduction through the heart, starting from the pacemaker?

Accepted Answer

SA Node → AV Node → Bundle of His → Bundle Branches → Purkinje Fibers

Question 3

A patient with low blood calcium is found to have elevated levels of a hormone that increases osteoclast activity and calcium reabsorption in the kidneys. Which hormone is responsible for this effect?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

Which of the following best explains why the left ventricle has a thicker myocardium than the right ventricle?

Accepted Answer

It pumps blood to the entire body, requiring greater force

Question 5

A person with blood type O negative ($$O^-) $$receives a transfusion of type AB positive ($$AB^+) $$blood. Which of the following best describes the likely outcome?

Accepted Answer

Severe transfusion reaction due to anti-A, anti-B, and anti-D antibodies attacking donor RBCs

Question 6

Which hormone is released in response to low blood glucose and acts to increase blood glucose levels by stimulating glycogen breakdown in the liver?

Accepted Answer

Glucagon

Question 7

A patient is diagnosed with polycythemia. Which of the following complications is most likely to occur as a result of this condition?

Accepted Answer

Increased blood viscosity and higher risk of clot formation

Question 8

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

Accepted Answer

Maintains osmotic pressure and prevents fluid loss from blood vessels

Question 9

A patient with a pituitary tumor is found to have decreased secretion of antidiuretic hormone (ADH). Which of the following symptoms would most likely be observed?

Accepted Answer

Excessive urination and dehydration

Question 10

Which of the following is the correct pathway for blood flow through the heart starting from the vena cava?

Accepted Answer

Superior/Inferior Vena Cava → Right Atrium → Tricuspid Valve → Right Ventricle → Pulmonary Semilunar Valve → Pulmonary Trunk → Pulmonary Arteries → Lungs → Pulmonary Veins → Left Atrium → Mitral Valve → Left Ventricle → Aortic Semilunar Valve → Aorta

Question 11

Which of the following best explains why cardiac muscle cells are able to contract in a coordinated manner?

Accepted Answer

They are connected by gap junctions that allow rapid spread of action potentials

Question 12

A patient is found to have a deficiency in erythropoietin (EPO) production due to chronic kidney disease. Which of the following laboratory findings would most likely be present?

Accepted Answer

Decreased RBC count and anemia

Question 13

Which of the following best describes the effect of aldosterone released from the adrenal cortex?

Accepted Answer

Increases sodium retention by the kidneys, raising blood pressure

Question 14

A patient with a history of allergies presents with an elevated eosinophil count. Which of the following best explains the function of eosinophils?

Accepted Answer

They combat parasitic infections and are involved in allergic responses

Question 15

Which of the following is a correct example of hormonal antagonism?

Accepted Answer

Insulin and glucagon regulating blood glucose in opposite directions

Question 16

A patient is experiencing excessive bleeding after a minor injury. Laboratory tests reveal a low platelet count. Which step of hemostasis is most directly affected?

Accepted Answer

Platelet plug formation

Question 17

Which of the following best describes the function of the cardiac skeleton?

Accepted Answer

It provides electrical insulation between the atria and ventricles

Question 18

A patient with a thyroid disorder has elevated T3 and T4 levels. Which of the following symptoms would most likely be observed?

Accepted Answer

Increased metabolic rate and heat intolerance

Question 19

Which of the following best explains why the pulmonary circuit is associated with the right side of the heart?

Accepted Answer

The right heart pumps deoxygenated blood to the lungs for oxygenation

Question 20

A patient is found to have a mutation affecting gap junctions in cardiac muscle. Which of the following would most likely result from this mutation?

Accepted Answer

Slowed or uncoordinated spread of action potentials, impairing heart contraction

A&P Study Guide: The Endocrine System, Blood, and The Heart

Study Guide - Practice Questions

Study Guide - Flashcards