Heart Anatomy and Blood Circulation

​ (a)   carry blood to the heart, while ​ (b)   carry blood away from the heart.

• veins
• arteries
• valves
• atria

The ​ (a)   are the upper chambers of the heart and the ​ (b)   are the lower chambers.

• atria
• ventricles
• atrioventricular
• arteries
• capillaries

The ​ (a)   valve is between the right atrium and ventricle. The ​ (b)   valve is between the right ventricle and the pulmonary artery. The ​ (c)   valve is between the left atrium and ventricle. The ​ (d)   valve is between the left ventricle and the aorta.

• tricuspid
• pulmonic
• mitral
• aortic

The pulmonary artery carries blood to the lungs to receive ​ (a)   and drop off ​ (b)   .

• oxygen
• carbon dioxide
• nitrogen, sulfur dioxide
• hydrogen, methane
• carbon monoxide, ammonia