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
An open circulatory system.
The male reproductive system
Blood Flow Through the Cardiorespiratory System
A typical lubrication system, showing the oil pan, oil pump, oil filter, and oil passages.
The urinary system: Relationship of the kidneys to the vertebrae
Sensory systems and Endocrine system