ATI RN
Cardiovascular System Practice Questions Questions
Question 1 of 5
The relaxation of vascular muscles that decreases resistance to blood flow
Correct Answer: B
Rationale: Vasodilation (B) relaxes vascular smooth muscle, reducing resistance and increasing flow. Vasoconstriction (A) increases resistance, others (C, D) are unrelated.
Question 2 of 5
Which of the following hormones stimulates the development of megakaryoblasts?
Correct Answer: B
Rationale: Thrombopoietin (B) from liver/kidneys stimulates megakaryoblasts to form platelets. EPO (A) affects RBCs, NO (C) dilates vessels, hGH (D) promotes growth.
Question 3 of 5
Destruction of red bone marrow due to radiation results in
Correct Answer: B
Rationale: Aplastic anemia (B) is marrow failure (e.g., from radiation), reducing all blood cells.
Question 4 of 5
In the formation of blood cells, the megakaryocyte ultimately forms:
Correct Answer: B
Rationale: Megakaryocytes (B) fragment into platelets.
Question 5 of 5
The element in hemoglobin that allows oxygen to be transported is:
Correct Answer: C
Rationale: Iron (C) in heme binds oxygen.