The Cardiovascular System

Which statement best describes the flow of blood through the veins?

Blood enters the smallest veins first, flows through larger venules, and then terminates in the vena cava. After leaving the capillaries, small veins transport the blood into larger and larger venules until they terminate into the vena cava. The vena cava deposits the blood into the right atria.

Which statements describe the function of veins?

Returning deoxygenated blood to the heart The main function of veins is to return deoxygenated blood back to the heart. Depositing blood into the right atria so it can recirculate The venous system terminates by depositing blood into the right atrium so it can be reoxygenated and subsequently recirculate in the body.

What is the significance of venous valves in the arms and legs?

Preventing pooling of blood in the vein The valves in the veins prevent blood from flowing backward and pooling in the extremities.

Which is the only structure that carries oxygenated blood to the heart?

Pulmonary vein The pulmonary vein carries oxygenated blood from the lungs to the left atria. This is the only vein in the entire body that carries oxygenated blood.

What are the lower chambers of the heart responsible for?

Pumping blood out The bottom chambers of the heart, known as ventricles, are responsible for pumping out blood.

Why are the walls of veins thinner than the walls of arteries?

Veins do not have a muscular lining. Veins do not have a muscular lining as arteries do, which is why they are thinner than arteries.

Why is the delivery of erythrocytes by the arterioles essential?

Erythrocytes are blood cells that carry oxygen to cells. Erythrocytes, known as red blood cells, carry oxygen attached to hemoglobin molecules and deliver to other cells.

Blood passes through which valve to arrive at the left ventricle?

Mitral The mitral, or bicuspid valve, allows blood to pass from the left atria to the left ventricle.

What are the top chambers of the heart responsible for?

Receiving blood The top chambers of the heart, known as atria, are responsible for receiving blood.

What are the functions of the right and left coronary arteries?

Carrying oxygen and nutrients to the myocardium The right and left coronary arteries provide the myocardium and endocardium with oxygen and nutrients to their respective sides of the heart. Providing continuous blood flow to the layers of the heart The right and left coronary arteries provide continuous blood flow to the layers of the heart that keep the muscle cells functioning. Maintaining proper functioning of the atria, ventricles, and conduction system The coronary arteries supply blood to the heart muscle to maintain normal functioning of the heart chambers and conduction system.

Which statement best describes the aorta?

Large blood vessel attached to the left ventricle that begins taking oxygenated blood away from the heart The aorta is the largest artery in the body that accepts blood directly from the left ventricle. Other large arteries branch off from the aorta and form arterioles that distribute blood throughout the body.

Which valve allows blood to flow from the heart to the lungs?

Pulmonary The pulmonary valve allows blood to pass from the right ventricle to the pulmonary artery, which carries blood to the lungs.

What are arterioles?

Small arteries that branch off from larger arteries Arterioles are small arteries that branch off from larger arteries. These vessels get smaller and smaller until they terminate into capil

Which statements describe the function of arteries?

The aorta accepts blood ejected from the left ventricle. The aorta is the largest artery in the body. It accepts blood ejected from the left ventricle. Arteries carry oxygenated blood away from the heart. With the exception of one artery, arteries carry oxygenated blood away from the heart and distribute it to the cells of the body. The pulmonary artery carries deoxygenated blood away from the heart to the lung. The pulmonary artery is the only artery that carries deoxygenated blood.

After blood empties from the atria through the tricuspid and mitral valves, what do the valves do next?

The chordae tendineae tightly close the valves. After blood empties from the atria through the mitral and tricuspid valves, the chordae tendineae tightly close the valves to prevent leaking of blood back into the atria.

What does the aortic valve do?

Allows blood to pass from the left ventricle to the aorta The aortic valve is responsible for opening and allowing blood to flow from the left ventricle into the aorta.