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Human Body Systems › ViewMy heart is a _________, that pumps blood through the body.
A. Cell
B. Tissue
C. Muscle
D. Bone
Excretory System › View
What is the main function of the excretory system?
A. to collect and remove wastes from the body
B. to strengthen skeletal muscles
C. to protect the nervous system
D. to bring oxygen to body cells