What is the purpose of the spleen?
a. It is an organ whose many ducts clean the lymphatic system.
b. Assists the kidneys in processing insulin.
c. It is a ductless organ that filters blood.
d. It is the primary storage area for lymphocytes.
Question 2
The natural killer cells that circulate the body:
a. are present in infants and children, but disappear by middle age
b. engulf teratogens and viruses and devour them
c. push infected cells through the body to the spleen
d. inject diseased cells by injecting them with toxic chemicals
Urinary system
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