Question

what part of the heart delivers unoxygenated blood to the lungs?
a pulmonary artery
b pulmonary vein
c aorta
d left ventricle

question 2
what part of the hearts electrical system is known as the \gatekeeper\?
a sa node
b bundle of his
c av node
d purkinje fibers

questions filter (11)

Explanation:

Question 1:

To determine the part of the heart that delivers unoxygenated blood to the lungs, we analyze each option:

• Option A: The pulmonary artery carries unoxygenated blood from the right ventricle to the lungs for oxygenation.
• Option B: The pulmonary vein carries oxygenated blood from the lungs to the left atrium, so it's incorrect.
• Option C: The aorta carries oxygenated blood from the left ventricle to the rest of the body, so it's incorrect.
• Option D: The left ventricle pumps oxygenated blood into the aorta, so it's incorrect.

To identify the "gatekeeper" of the heart’s electrical system, we analyze each option:

• Option A: The SA (sinoatrial) node is the heart’s natural pacemaker, initiating electrical impulses, not the gatekeeper.
• Option B: The Bundle of His transmits electrical impulses from the AV node to the ventricles, not the gatekeeper.
• Option C: The AV (atrioventricular) node delays electrical impulses to allow the atria to contract before the ventricles, acting as the "gatekeeper" to control the flow of impulses between atria and ventricles.
• Option D: Purkinje fibers distribute electrical impulses to the ventricles, not the gatekeeper.

Answer:

A. Pulmonary artery

Question 2: