1. _______ is composed of the kidney.
A. Skeletal system
B. Urinary system
C. Muscular system
D. Digestive system

2. An organ whose main function is to remove liquid waste from the blood in the form of urine.
A. Heart
B. Instestine
C. Kidney
D. Lungs

3. It is a bean-shaped paired organ which are about four to five inches long and two to three inches wide.
A. Stomach
B. Lungs
C. Heart
D. Kidney

4. The kidney removes urea from the blood through tiny filters called _______.
A. Nephrons
B. Neurons
C. Neptune
D. Newton

5. _______ is a hollow muscular organ located near the lungs and is protected by the ribcage.
A. Lungs
B. Heart
C. Stomach
D. Liver

6. The heart is made up of _______ muscles which is an example of an involuntary muscle.
A. Skeletal
B. Smooth
C. Cardiac
D. Rough

7. The heart’s function is to _______.
A. Enable us to stand.
B. Remove waste from the blood.
C. Digest food.
D. Pump blood to the different parts of the body.​