Human Circulatory System: Blood Flow and Gas Exchange Process

What type of blood returns to the heart from the body?

Oxygen-poor blood

What are the two large veins that carry blood to the right atrium?

Superior vena cava and inferior vena cava

Which chamber of the heart does blood enter first after returning from the body?

Right atrium

What valve does blood pass through from the right atrium to the right ventricle?

Tricuspid valve

What happens when the right ventricle contracts?

It pumps blood through the pulmonary valve into the pulmonary arteries.

What process occurs in the lungs that changes oxygen-poor blood to oxygen-rich blood?

Gas exchange

How does oxygen-rich blood return to the heart from the lungs?

Through the pulmonary veins

Which chamber of the heart receives oxygenated blood from the lungs?

Left atrium

What valve does blood flow through from the left atrium to the left ventricle?

Mitral (bicuspid) valve

What is the final chamber that pumps oxygen-rich blood out of the heart?

Left ventricle

What major artery carries blood from the heart to the rest of the body?

Aorta

What is the primary function of the oxygen delivered to cells by the blood?

To produce energy