The heart is composed of how many loops?
a.1
b.2 <
c.3
d.4 2. the blood vessel that carry blood from the heart to the rest of the body

a. capillaries
b. veins
c. arteries <
d. valves 3. if you catch a cold, which component of blood do you rely on to attack the virus that has invaded your blood stream?

a. plasma
b. red blood cells
c. white blood cells <
d. platelets 4. which component of blood is used to create a scab after you cut your finger?

a. plasma <
b. red blood cells
c. white blood cells d platelets 5. two key components to keeping your healthy that are within our control are exercise

a. diet <
b. rest
c. heredity
d. environment