_______1. what is the main function of blood vessels?
a. They pump blood to the heart.
b. They filter the blood.
c. they carry blood to different parts of the body.
d. They carry messages from the brain to the all parts of body.

_______2. Which of the following can best be compared to soldiers?
a. red blood cells.
b. white blood cells
c. platelets.
d. plasma.

_______3. What happens when a blood clot occurred in an injured blood vessel?
a. you will be experiencing hemorrhage.
b. a coating will form on the skin surface.
c. the platelets attach to the edges of the cut and to one another, forming a plug up.

_______4. It carries oxygen to the body tissue.
a. red blood cells.
b. white blood cells.
c. platelets.
d. plasma.

_______5. what type of blood vessel carries blood away from the heart?
a. artery
b. vein
c. capillary
d. both a and b

_______6. It helps defend body against infection or bateria.
a. red blood cells.
b. white blood cells
c. platelets
d. plasma

_______7. What type of blood vessel carries blood back from the heart?
a.artery
b. vein
c. capillary
d. both b and c

________8. what type of blood vessel forms a network connecting the arterioles with the venules?
a. artery
b. vein
c. capillary
d.. borh b and c

_______ 9. these are blood cells that help stop bleeding.
a. red blood cells
b. white blood cells
c. platelets
d. plasma

________ 10. these are affected if the person is experiencing dengue fever.
a. lymphocytes
b. erythrocytes
c. plasma
d. thrombocytes