1.  The ________ is the group of organs that get rid of cell waste.
A. kidneys
B  respiratory system
C. trachea
D. excretory system

2.  An organ in the excretory system that filters cell wastes from the blood is a(n) ________.
A. kidney
B. urinary bladder
C. air sac
D. stomach

3.  A waste liquid formed in the kidneys is ________.
A. kool-aid
B. diaphragm
C. urine
D. water

4.  Urine is temporarily stored in a muscular, baglike organ called the ________.
A. urinary bladder
B. air sac
C. zip-loc bag
D. diaphragm

5.  A(n) ________ brings blood to the kidneys.
A. air sac
B. artery
C. vein
D. none of the above

6.  A(n) ________ carries cleaned blood away.
A  artery
B. red blood cell
C. neutron
D. vein

7.  Kidneys are the size of your ________.
A. head
B. finger nail
C. fist
D. hand

8.  Carbon dioxide and water are produced when body cells ________.
A. break down sugar to release energy
B. move really fast
C. move really slow
D. release nitrogen to give energy

9.  ________ is the watery part of blood that carries nutrients, wastes, and blood cells.
A. Platelets
B. Plasma
C. Urine
D. Capillary

10.  The word excretes means ________.
A. take in
B. run away
C. exhale
D. get rid of

11.  Urine consists of ________.
A  extra water, nutrients, and cell wastes
B  nutrients, all wastes, and carbon dioxide
C  carbon dioxide, cell wastes, and mucus
D  nitrogen wastes, some salts, and extra water

12.  Your kidneys clean all of your blood ________ times a day.
A. 5
B. 10
C. 75
D. 40

13.  Your ________ also helps in the excretory system.
A. skin and lungs
B. lungs and heart
C. spine and stomach
D. ears and nose

14.  Wastes form a liquid called ________.
A. blood
B. water
C. urine
D. iced tea

15.  ________ carries cell wastes to body organs that get rid of the wastes.
A. Plasma
B. Capillaries
C. Arteries
D. none of the above