Extra Credit

Blood flows from the right atrium to the right ventricle through the __________ valve.

tricuspid

The contraction of the __________ muscles assists in pumping blood from the right ventricle to the pulmonary artery.

papillary

Air moves in and out of the lungs through a process called __________.

ventilation

In the alveoli, __________ interact with the alveoli, facilitating external respiration.

capillaries

External respiration is a specific term for the process that occurs in the __________.

lungs

Carbon dioxide moves from the blood into the __________, while oxygen moves from the alveoli into the blood.

alveoli

Oxygenated blood from the lungs enters the heart through the __________ veins.

pulmonary

Blood flows into the left atrium from the lungs and then into the __________ before being pumped out to the body.

left ventricle

The __________ valve is the general name for the valves in the pulmonary artery and the aorta.

aortic

Coronary circulation occurs after blood flows to the upper body and __________.

arms

Arteries carrying blood away from the heart become __________ as they approach the tissues.

smaller

Internal respiration involves the exchange of __________ from the blood to tissues.

oxygen

Cellular respiration produces __________, with carbon dioxide and water as by-products.

ATP

Sugar or carbohydrates combine with __________ to produce ATP.

oxygen

The purpose of the respiratory system is to produce energy and by-products like __________ and water.

carbon dioxide

Blood from the venocapillaries flows into __________, medium veins, and major veins.

small veins

Major veins carry blood to the __________.

heart

Blood circulation consists of __________ and systemic circulation.

pulmonary

The respiratory system's key function is to facilitate __________, providing oxygen to the blood.

gas exchange

Oxygen-poor blood returns to the right atrium of the heart, then moving to the right __________.

ventricle

The oxygenated blood travels through the __________ veins to the left atrium.

pulmonary

As blood travels through arteries and arterioles, it eventually reaches __________, where internal respiration occurs.

capillaries

Cellular respiration utilizes oxygen and glucose while generating __________ and water as by-products.

carbon dioxide

The digestive system breaks down complex molecules into __________ molecules for absorption.

simple