ATI LPN
NCLEX Cardiovascular Questions Questions
Question 1 of 5
The condition in which the AV node fails and the electrical stimulus does not reach the ventricles is called a(an)
Correct Answer: A
Rationale: A heart block occurs when the AV node fails to transmit the signal to the ventricles.
Question 2 of 5
Identify the hormone(s) that will increase blood volume and thus blood pressure.
Correct Answer: B
Rationale: ADH (antidiuretic hormone) increases water reabsorption, and aldosterone increases sodium reabsorption, both increasing blood volume and pressure. ANH (atrial natriuretic hormone) decreases blood volume.
Question 3 of 5
Which of the following terms identifies the anatomical region found between the lungs that extends from the sternum to the vertebral column and from the first rib to the diaphragm?
Correct Answer: D
Rationale: The mediastinum is the central region between the lungs, containing the heart and other structures.
Question 4 of 5
In comparison to skeletal muscle fibers, the contractile fibers of the heart are depolarized for_____ period of time.
Correct Answer: B
Rationale: Cardiac muscle cells remain depolarized for a longer period due to the plateau phase of the action potential, which helps sustain contraction and prevent tetanus.
Question 5 of 5
One function of the pericardial sac is protection against friction.
Correct Answer: A
Rationale: The pericardial sac contains fluid to reduce friction between the heart and surrounding structures during movement.