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 are...

a. capillaries
b. veins
c. arteries <----------------
d. valves 3. If you catch a cold, which component of blood do you rely on to help 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 help 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 and...

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