Transcript PowerPoint Presentation - Digestive/Excretory System

Science Sponge
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List the accessory organs of the
digestive system and its functions.
Science Sponge
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What blood vessel is responsible for
taking blood to the heart?
What kind of bone allows for flexible
movement and stress?
What does the lymphatic system do?
Science Sponge
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This is the process for food being led
to the stomach. What is it?
The chemical that mixes with your
food in the stomach
Science Sponge
List three things that you know about
the blood, such as parts of the blood,
the places where blood cells form,
and the function of blood throughout
the body.
Digestive/Urinary System
Life Science
Ronald E. McNair Middle
School
Parts of the Digestive System
Mouth
Pharynx
Esophagus
stomach
small intestine
large intestine
Colon-rectum
anus
Accessory Parts
Accessory Organs
Salivary Glands
Pancreas
Liver and Gallbladder
Process--Mouth
Food enters the mouth (mechanical
disgetion)
Teeth grind, tear and chop food
Saliva moistens it
Amylase begins to break down carbs in
food
Soft mass of chewed food--BOLUS
Swallowing
Swallowing--muscles in the tongue and
mouth push food into…..
Esophagus--epiglottis keeps most food out
of the windpipe
Connects to the stomach at the pyloric
valve
Peristalsis forces food into stomach
Stomach
Stomach--churns and mixes food with acids
and enzymes
Three mechanical/chemical tasks
Storage
Mix food, liquid and digestive juices
Soup like mass called CHYME
Empty contents slowly into small intestine
Small Intestine
Pyloric sphincter allows chyme into
duodenum
Bile from pancreas added
Digestion continues
Absorption begins
Villi--finger like projections
Role of Accessory Organs
Liver--produces bile to help absorb
fat; processes nutrients
Gallbladder--stores bile
Pancreas--produces enzymes;
neutralizes stomach acids
Large Intestine
Main function--remove water from
undigested matter and form solid
wastes
Colon--solid wastes are stored until
expelled through the rectum
Urinary System
Contains organs that remove waste
products from your blood
Three body systems have a role in
excretion: integumentary, respiratory,
and finally the urinary system.
Lungs
Remove carbon dioxide and water
vapor
Skin
Blood flows through vessels of the
skin
Water, salt and other wastes diffuse
through the sweat glands
Solid wastes stay on the skin
Liquids evaporate and cool the body
Kidneys
Located on either side of backbone
Filters waste from other body
systems
Makes sugar available as fuel and
sends it to tissues
Removes toxic chemicals in the
bloodstream
Kidneys
Blood circulates collecting waste
Enters kidneys
Reaches NEPHRONS--filtering units
Remove excess water, salt and urea from blood
Material left in nephron is urine
Passes into 2 tubes called URETERS which
connect to urinary bladder
Urine passes through URETHRA--and out
Urinary System Problems
Bacterial infections: infections can
get into the bladder, and cause
painful infections
Kidney stones: salts and wastes
collect inside the kidneys and form
kidney stones
Urinary System Problems
Kidney disease: damage to nephrons
prevent normal kidney functioning, a
person will end up on dialysis to help
filter the blood.
Some pics to think about…