B. Flow pathway

Question 1

1 Blood enters

Answer 1

right atrium from superior and inf. vena cavea

Question 2

2 Blood in right atrium

Answer 2

flows through right AV valve in to right AV valve in to right ventricle

Question 3

3 Contraction of right ventricle

Answer 3

forces pulmonary valve to open

Question 4

4 Blood flows

Answer 4

through pulmonary valve in to pulmonary trunk

Question 5

5 Blood is distributed

Answer 5

by right and left pulmonary arteries to the lungs

-unloads CO2 and loads O2

Question 6

6 Blood returns

Answer 6

from lungs via pulmonary veins in the left atrium

Question 7

7 Blood in left atrium

Answer 7

flows through left AV valve into left ventricle

Question 8

8 Contraction of left ventricle

Answer 8

step 3 ( the contraction of the right ventricle forces pulmonary valve to open) force aortic valve to open

Question 9

9 Blood flows through the aortic valve

Answer 9

into the ascending aorta

Question 10

10 Blood in aorta

Answer 10

is distributed to every organ in the body

-Unloads O2 and loads CO2

Question 11

Blood returns

Answer 11

to the heart via venae cavae