How does the heart work?
B. It helps maintain body posture.
D.It removes all the liquid wastes in the blood.
A. It pumps blood.
C. It processes and receives information.

Which statement tells the structure of the lungs?
A. Lungs are made up of hard tissues.
B. Lungs are made up of spongy tissues.
C. Lungs are made up of fingerlike tissues.
D. Lungs are made up of cotton like tissues.

How do the linings of the small intestine function? Theyfunction like a *
A. squeezer
B. absorber
D. juicer
C. filter

How do the kidneys remove urea from the blood? Through the ______________. *
A. fingerlike projections
B. hollow muscles
C. tiny filtering units called nephron
D. smooth muscles

Which sentence describes the structure of the heart?
A. It is made up of spongy tissues.
B. It forms the fleshy parts of the body.
C. It is made up of hollow muscular organ.
D. It is protected by soft tissues called meninges.