1. Chemicals produced by the body that attack invading organisms or poisons are called
A. antigens
B. antibiotics
C. antibodies
D. anemics
4. A vaccine produces _____immunity.
A. auto
B. mediated
C. passive
D. active
2. (True or False) Plasma is the fluid portion of the blood.
A. True
B. False
5. (True or False) A person with just one kidney cannot survive.
A. True
B. False
3. Which structure contains deoxygenated blood?
A. superior vena cava
B. left atrium
C. aorta
D. pulmonary veins
6. What is the main organs of the excretory system
A. lungs
B. heart
C. kidneys
D. bladder
