Question

part a write the letter that best answers the question or completes the thought.

1. platelets are helpful in

a fighting disease c digesting food
b removing carbon dioxide d clotting the blood

1. which of the following body parts is about the size of a human fist?

a the heart c the cornea
b the small intestine d the cochlea

1. which blood vessels carry blood to the heart?

a capillaries c plasma
b arteries d veins

1. what is the principal function of digestive enzymes?

a regulating gland secretions c breaking down food
b fighting disease d absorbing nutrients

1. almost half of our blood consists of

a white blood cells c red blood cells
b antibodies d capillaries
part b match the terms in column a with the descriptions in column b. write the letter of the correct answer on the line.
column a column b

1. circulatory system a the kidneys
2. respiratory system b glands
3. excretory system c blood vessels
4. nervous system d the small intestine
5. digestive system e bones
6. endocrine system f the lungs
7. skeletal system g biceps and triceps
8. muscular system h the spinal cord

Explanation:

1. Platelets are crucial for blood - clotting.
2. The heart is approximately the size of a human fist.
3. Veins carry blood to the heart.
4. Digestive enzymes break down food.
5. Red blood cells make up almost half of our blood.
6. The circulatory system involves blood vessels.
7. The respiratory system includes the lungs.
8. The excretory system is related to the kidneys.
9. The nervous system involves the spinal cord.
10. The digestive system includes the small intestine.
11. The endocrine system involves glands.
12. The skeletal system involves bones.
13. The muscular system involves biceps and triceps.

Answer:

1. D. clotting the blood
2. A. the heart
3. D. veins
4. C. breaking down food
5. C. red blood cells
6. C. blood vessels
7. F. the lungs
8. A. the kidneys
9. H. the spinal cord
10. D. the small intestine
11. B. glands
12. E. bones
13. G. biceps and triceps