Cardiovascular System Quiz2

How do the functions of atria and ventricles differ in the heart's pumping cycle?

• Atria pump to the body, ventricles receive blood.

• Atria receive blood arriving in the heart, while ventricles pump blood out to the lungs or body.

• They both pump with equal force.

• Atria are stronger than ventricles.

Why is the left ventricle wall thicker than the right ventricle wall?

• It has to pump blood a short distance.

• It contains more valves.

• It needs to generate more force to pump oxygenated blood throughout the entire body.

• It pumps blood at a slower rate.

How do the structures of arteries and capillaries relate to their different functions?

• Both have valves for one-way flow.

• Arteries have thick muscular walls to withstand high-pressure pumping, while capillaries have very thin walls for efficient gas exchange.

• Capillaries are larger than arteries.

• Arteries exchange gases, capillaries transport blood.

How do pulmonary and systemic circulation work together?

• They are independent systems.

• One circulates blood, the other circulates air.

• Pulmonary circulation oxygenates blood in the lungs, and systemic circulation delivers that oxygen to the body's tissues.

• Systemic circulation involves the heart and brain only.

What might happen if the septum in the heart was damaged?

• Blood would clot faster.

• The heart rate would slow down.

• Oxygenated and deoxygenated blood would mix, reducing oxygen delivery to the body.

• Blood pressure would become perfectly balanced.

Why is blood type compatibility critical for safe transfusions?

• It affects the color of the blood.

• Incompatible donor antigens will be attacked by the recipient's antibodies, causing dangerous clumping (agglutination).

• It only matters for plasma donations.

• It determines the iron content.

How do the roles of red blood cells, white blood cells, and platelets differ?

• They all fight infection.

• They all carry oxygen.

• RBCs carry gases, WBCs fight infection, and platelets help with clotting.

• They are all involved in nutrient transport.

How does the presence or absence of A/B antigens and antibodies determine who can donate to whom?

• People can always donate to their own type only.

• Type O lacks A/B antigens so it's safe for all; Type AB lacks anti-A/B antibodies so it can receive from all.

• Antigens are only important for plasma.

• Antibodies on RBCs determine compatibility.

What is a key sequence of events in the formation of a blood clot?

• Vessel dilation, then platelet aggregation.

• Vessel constriction, then platelet plug formation, then fibrin stabilization.

• White blood cells form the main plug.

• Plasma solidifies immediately.

How can lifestyle choices like diet affect cardiovascular health?

• They have no impact on blood vessels.

• Fatty foods can contribute to plaque buildup (atherosclerosis), which narrows arteries and increases clot risk.

• Exercise weakens the heart muscle.

• Smoking only affects the lungs, not the heart.