Biology Quiz

In an open circulatory system,

• blood leaves the heart via venules.

• hemolymph enters the heart via ostia.

• the heart has two or more chambers.

• nutrients are exchanged across the walls of capillaries.

• blood is pumped into cavities called ventricles.

A four-chambered heart, veins, arteries, and capillaries are found in

• insects.

• fish.

• amphibians.

• mammals.

• reptiles.

The pulmonary circuit in a closed circulatory system functions in

• gas exchange in the lungs.

• nutrient absorption from the intestine.

• waste disposal in the kidneys.

• creating proper blood pressure.

A major evolutionary change between the fish circulatory system and the circulatory systems of amphibians, birds, and mammals is the presence of a

• separate pulmonary circuit in fish.

• two-chambered heart in amphibians, birds, and mammals.

• double-loop pathway in amphibians, birds, and mammals.

• stronger atria in amphibians, birds, and mammals.

The figure shown here represents a four-chambered heart. The blood in the chamber marked by 'V'

• is rich in oxygen.

• is poor in oxygen.

• will next enter the left atrium.

• has come from the aorta.

A heart murmur is caused by

• improper closing of heart valves.

• high blood pressure.

• low blood sugar.

• excessive exercise.

In the cardiac cycle, diastole is the

• contraction of the ventricles.

• contraction of the atria.

• closing of the atrioventricular valves.

• relaxation of heart muscle.

If the sinoatrial node fails in the heart,

• the heart ceases to beat.

• the ventricles will beat at a higher rate.

• an artificial pacemaker can correct the problem.

• the heartbeat is unaffected.

Blood in veins is

• oxygenated.

• deoxygenated.

• rich in nutrients.

• high in carbon dioxide.

Pulmonary arteries take

• O₂-poor blood to the lungs.

• O₂-rich blood to the lungs.

• O₂-rich blood to the body.

• O₂-poor blood to the right atrium.