ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 of 5
Explain the reason there is a delay in processing the electrical signal from the AV node to the AV bundle. To:
Correct Answer: A
Rationale: The AV node delays the impulse (~0.1s) to allow atrial contraction to finish filling ventricles before ventricular systole (A). B occurs naturally, C is due to Purkinje fibers, and D is unrelated.
Question 2 of 5
The fluid that surrounds the cells of the body is called:
Correct Answer: D
Rationale: Tissue fluid (D), or interstitial fluid, surrounds cells, derived from plasma (C) leaking from capillaries. Blood (A) is in vessels, lymph (B) is in lymphatic vessels.
Question 3 of 5
The respiratory pump ___ the pressure difference between the abdominal region and the thoracic region thus leading to a(n) ___ in venous return.
Correct Answer: D
Rationale: The respiratory pump increases the thoracoabdominal pressure gradient (D) during inspiration (low thoracic pressure), enhancing venous return to the heart.
Question 4 of 5
Identify the vessels that branch off the aortic arch.
Correct Answer: A
Rationale: The aortic arch branches into the brachiocephalic, left common carotid, and left subclavian arteries (A). B is descending aorta, C are veins, D is ascending aorta.
Question 5 of 5
Normally cardiac cycle takes complete:
Correct Answer: D
Rationale: At a normal heart rate of 75 bpm, the cardiac cycle lasts ~0.8 seconds (D, 60/75 = 0.8 s). A, B, and C are too short for a full cycle.