Blood Flow in the Heart

What is the first step in the blood flow through the heart?

• A) Blood enters right atrium from superior and inferior vena cavae.

• B) Blood flows through right AV valve into right ventricle.

• C) Blood is distributed by pulmonary arteries to the lungs.

• D) Blood returns from lungs to left atrium.

Blood in the right atrium flows through the _______ valve into the right ventricle.

• Mitral

• Aortic

• Tricuspid

• Pulmonary

Which valve opens due to the contraction of the right ventricle?

• A) Aortic semilunar valve

• B) Pulmonary semilunar valve

• C) Mitral valve

• D) Tricuspid valve

Blood is distributed by the right and left pulmonary arteries to the lungs, where it unloads CO2 and loads _______.

• Nitrogen

• Oxygen

• Carbon Dioxide

• Hydrogen

After returning from the lungs, blood enters which chamber of the heart?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle

Blood in the left atrium flows through the _______ valve into the left ventricle.

• Tricuspid

• Mitral

• Pulmonary

• Aortic

What happens when the left ventricle contracts?

• A) Aortic semilunar valve opens

• B) Pulmonary semilunar valve opens

• C) Blood flows into right atrium

• D) Blood flows into left atrium

Blood flows through the aortic valve into the _______.

• Pulmonary trunk

• Ascending aorta

• Right atrium

• Left atrium

Trace the flow of blood in order

e

f

g

h

d

c

b

a

2

3

7

1

6

8

5

4