breaking down food into simplier substances that your body can use
digestion
a watery fluid that softens and moistens food
saliva
the long muscular tube that brings food into the stomach
esophagus
a muscular organ that changes food into a thick soupy liquid
stomach
the organ that completes digestion and allows digested food to enter the blood
small intestine
the thick tube-like organ that removes undigested waste
large intestine
a large, flat muscle that pulls air in and pushes air out of the lungs
diaphragm
one of two organs that fills with air when you inhale
lung
air sacs in the lungs where gases move into and out of the blood
alveoli
a muscular organ that constantly pumps blood throughout the body
heart
a thick-walled blood vessel that carries blood away from the heart
artery
a blood vessel that carries blood back to the heart
vein
a tiny blood vessel
capillary
an organ that filters certain body wastes out of the blood
kidney
a part of the kidneys where waste materials are separated from useful materials in the blood
nephron
a tube that carries urine from the kidney to the urinary bladder
ureter
an organ that stores liquid wastes from the kidneys temporarily
(urinary) bladder