ATI RN
100 Questions on the Cardiovascular System Questions
Question 1 of 5
Formation of blood clot is known as:
Correct Answer: A
Rationale: A thrombus (A) is a blood clot in a vessel. Thrombosis (C) is the process, fibrinolysis (B) is clot breakdown, and 'clot' (D) is vague but synonymous with thrombus.
Question 2 of 5
Ventricular muscle receives impulses directly from the:
Correct Answer: A
Rationale: The Purkinje system (A) directly activates ventricular muscle. Bundle of His (B) and branches (C) precede, AV node (D) delays.
Question 3 of 5
Identify the structure found in a fetus that allows blood to flow directly from the pulmonary trunk into the aorta.
Correct Answer: D
Rationale: The ductus arteriosus shunts blood from the pulmonary trunk to the aorta in the fetus, bypassing the lungs. Fossa ovalis (A) and foramen ovale (B) are atrial structures, trabeculae (C) are ventricular ridges.
Question 4 of 5
Which part of the brain contains the cardiovascular center that regulates heart rate?
Correct Answer: C
Rationale: The medulla oblongata (C) houses the cardiovascular center, regulating heart rate via autonomic nerves. Midbrain (A), cerebrum (B), and cerebellum (D) have other roles.
Question 5 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).