Lym phatic system
Lymph vessels and nodes filter fluid from
spaces between cells and tissues into the
blood and produce cells that fight diseases
and foreign organisms.
Resp iratory system
The pharynx, trachea, bronchial passageways,
and lungs form a ventilation system that brings
in oxygen and removes carbon dioxide from the
blood, while helping to maintain the acidity of
the blood. The larynx produces sounds.
D igestive system
The mouth, esophagus, stomach, intestines,
liver, gallbladder, and pancreas form a system
that mechanically and chemically breaks down
food, absorbs the molecules from it, and
eliminates solid wastes.
The kidneys, ureters, bladder, and urethra form a
filtration system that regulates the ionic
composition of the blood and body fluids and
The male’s testes make sperm cells, and the seminal vesicles, prostate, and penis
provide a delivery system for the sperm. The female’s ovaries make the eggs, and the
tubes, uterus, and vagina provide places to receive the sperm,
fertilize the egg, incubate the developing offspring, and deliver the baby.
Body Structure Is Closely Linked to Function at All Levels of Organization