ATI RN
100 Questions on the Cardiovascular System Questions
Question 1 of 5
The greatest resistance to blood flow occurs in the:
Correct Answer: B
Rationale: Arterioles (B) offer the greatest resistance due to their small diameter and muscle control (Poiseuille’s law).
Question 2 of 5
The volume of blood pumped out of a ventricle by each heartbeat
Correct Answer: C
Rationale: Stroke volume (C) is the blood volume per beat (~70 ml). Cardiac output (A) is per minute, heart rate (B) is beats, afterload (D) is resistance.
Question 3 of 5
Which of the following blood cells is involved in reducing blood loss from a damaged blood vessel?
Correct Answer: B
Rationale: Platelets (B) form clots to reduce blood loss. Erythrocytes (A) carry oxygen, lymphocytes (C) are immune, basophils (D) release histamine.
Question 4 of 5
Which of the following precursor cells eventually give rise to the platelets?
Correct Answer: A
Rationale: Megakaryoblasts (A) fragment into platelets. Others form RBCs (B), granulocytes (C), or lymphocytes (D).
Question 5 of 5
Which mature cell has no nucleus, mitochondria, or ribosomes?
Correct Answer: A
Rationale: Erythrocytes (A) lack organelles for oxygen transport efficiency.