How Blood Flows Through the Heart

In this episode of Interactive Biology TV, Leslie Samuel explains how blood flows through the heart, marking the start of the circulatory system series. The video covers the anatomy of the heart, including the atria, ventricles, and various valves such as the tricuspid, bicuspid, mitral, aortic, and pulmonary valves. It details the one-way flow of blood through the heart, starting from the vena cava, through the right atrium and ventricle, to the lungs, and back through the left atrium and ventricle to the aorta. The video emphasizes the simultaneous contraction of atria and ventricles, ensuring efficient blood circulation to the lungs and the rest of the body.

What is the orientation of the heart's sides when viewed from the front?

• Right side is on the left, left side is on the right

• Both sides are on the right

• Left side is on the left, right side is on the right

• Both sides are on the left

Which valve is located between the right atrium and the right ventricle?

• Pulmonary valve

• Tricuspid valve

• Aortic valve

• Mitral valve

What is the function of the semilunar valves?

• To allow blood to flow from atria to ventricles

• To oxygenate the blood

• To allow blood to leave the ventricles

• To prevent backflow of blood into the atria

Through which vessel does blood return to the heart from the body?

• Vena cava

• Aorta

• Pulmonary vein

• Pulmonary artery

What happens to blood when it reaches the lungs?

• It loses oxygen

• It is pumped to the body

• It picks up oxygen

• It becomes deoxygenated

How do the atria and ventricles contract during the heart's pumping action?

• Only one atrium and one ventricle contract at a time

• Atria contract first, then ventricles

• Ventricles contract first, then atria

• Both atria and ventricles contract simultaneously

What is the primary function of the heart in the circulatory system?

• To oxygenate the blood

• To pump blood to the body and lungs

• To filter blood

• To store blood