Science crossword puzzle?

Question

If you just answer one of these words i would still greatly appreciate it

across:

1.) flaps of tissue that allow blood to flow in only one direction
(5 letters)

3.) red fluid that circulates throughout the body
(5 letters)

5.) blood cells that carry oxygen
(13 letters)

7.) system that transports materials throughout the body
(17 letters)

11.) a blood vessel that carries blood from the body to the heart in the right atrium
(8 letters)

12.) a blood vessel that carries blood away from the heart.
(6 letters)

13.) each of the two lower chambers to the heart
( 9 letters)

14.) blood cells that help the body fight disease

Down:

2.) an upper chamber of the heart (6 letters)

4.) the liquid part of the blood (6 letters)

6.) a blood vessel that carries blood toward the heat (4 letters) ( i think it is vein)

7.) blood vessels whose walls are only one cell thick (11 letters)

8.) the largest artery of the body ( 5 letters)

9.) cell fragments that help the blood to clot.
( 9 letters)

10.) pumps blood throughout the body
(5 letters)

Answer 1

1 Valves

3. blood

5. red blood cells

7. circulatory system

11. vena cava? (i'll double check)

13. ventricle

14. White blood cells or leukocytes

2. atrium

4. plasma

6. vein

7. capillary

8. aorta

9. platelets

10. heart

Answer 2

Circulatory System Crossword Puzzle Answers

Answer 3

Heart Chambers Crossword

Answer 4

1. valves
3. blood
5.erythrocytes
7. circulatory system
11. vena cava
12. artery
13. ventricle
14. leucocyte (white blood cell)

2. atrium
4. plasma
6. vein
7. capillary
8. aorta
9. platelets
10. heart

Answer 5

Chemical