Body Systems
Digestive-Circulatory-Respiratory-Reproductive
Digestive System
• The digestive system is
used for breaking down
food into nutrients
which then pass into
the circulatory system
and are taken to where
they are needed in the
body.
1. Mouth
• When food enters the mouth it
starts the breakdown process
• Physically being broken down by
the teeth.
• Chemically being broken down by
amylase
2. Epiglottis to Esophagus
• Food is formed
into a bolus and
then swallowed.
• The epiglottis
chooses the
pathway to
trachea or
esophagus.
3. Stomach
• The stomach has folds called rugae
which expand and contract with gastric
juices(made by the stomach) to digest
food(stomach acid, mucus and
enzymes).
• Proteins are broken down in the
stomach.
4. Small Intestines
• In the small intestine, bile
(produced in the liver and
stored in the gall bladder),
pancreatic enzymes, and other
digestive enzymes produced by
the inner wall of the small
intestine help in the
breakdown of food.
• 5m long
Small Intestine Help
• Pancreas- enzymes to
break down the
carbohydrate, fat, and
protein in food.
• The Liver produces yet
another digestive juice—
bile. The bile is stored
between meals in the
gallbladder. Bile helps
digest fats.
5. Large Intestine
• In the large intestine, some of the water and electrolytes
• 5 ft
6. Anus
• Solid waste is then stored in the rectum until it is excreted via the
anus.
Circulatory system
• Blood cells are produced in the spine, ribs,
and pelvis
Receiving O2
Filters
• Kidneys. The kidneys are two bean-shaped organs, each about the
size of a fist. They are located just below the rib cage, one on
each side of the spine. Every day, the kidneys filter about 120 to
150 quarts of blood to produce about 1 to 2 quarts of urine. The
kidneys work around the clock; a person does not control what
they do.
• Ureters
• Bladder
• Urinary tract
Filter
• The spleen acts as a filter for blood as
part of the immune system. Old red blood
cells are recycled in the spleen, and
platelets and white blood cells are stored
there. The spleen also helps fight certain
kinds of bacteria that cause pneumonia
and meningitis.
Filters
• The liver monitors the contents of blood and remove many
potentially toxic substances before they can reach the rest of the
body.