DIGESTIVE SYSTEM FUNCTION Process of breaking down food

DIGESTIVE SYSTEM

FUNCTION Process of breaking down food into chemical substances that can be used to obtain energy Occurs in the gastrointestinal tract aka digestive tract

Where does digestion begin… end? A long winding tube beginning at the mouth to the anus

Structure Mechanical & Chemical breakdown of food into nutrients • Mouth: Begin with a bite, mechanical phase mixed with saliva chemical phase, forced down pharynx swallowing action • Esophagus: A simple conduit between the mouth and stomach - clearly important but only marginally interesting compared to other regions of the tube. • Stomach: J shape bag with muscles; mechanical & chemical- enzymatic digestion of proteins initiated and food reduced into liquid

Structure • Liver: The center of metabolic activity in the body - its major role in the digestive process is to provide bile salts to the small intestine, which are critical for digestion and absorption of fats • Gallbladder: stores & concentrates bile • Pancreas: Important role provides a mixture of digestive enzymes to the small intestine which are critical for digestion of fats, carbohydrates and protein

Structure • Small Intestine: long coiled tube that performs Chemical digestion: glands inside release enzymes that complete digestion & Absorption: end product of digestion, lining surface where nutrients are transferred into the circulatory system

Structure • Large Intestine: (colon) final organ of digestion some absorption, solidification of waste move material towards rectum finally out the anus

What is Halitosis? Bad breath resulting for decomposing food particles accumulate in the mouth allowing bacteria to flourish

What is spit? Mixture of water, mucus and digestive enzyme called salivary amylase

What is heartburn? Sharp burning pain that occurs when gastric juice is regurgitated (reflux) into the esophagus. . Symptoms similar to heart attack

Why do you get diarrhea? Result of contents moving through intestines without sufficient time for the water to be absorb

Urinary System

Function Group of organs that filter, store and eliminates waste products Kidneys & Lungs & Skin all excrete waste

What are the main waste products of the body? Carbon dioxide from cellular respiration &nitrogenous compounds from the breakdown of proteins

Structure Urine flows from kidneys down tube called ureter into the bladder ( muscle storage sac) until forced out of the body through a tube called the urethra Release of urine is necessary because of toxic materials

Function • Kidneys- Primary excretory organs, two bean shape about size of a fist, located behind the stomach Removes toxins, urea, water and mineral salts from the blood. Excrete waste in form of urine.

Why does urine smell like ammonia? Ammonia is a chemical compound of Nitrogen

How much urine must be released every day to remove the toxic materials & maintain homeostasis? AT LEAST 17 oz.

How much urine does a normal adult release a day? Between 1. 5 L – 2. 3 L depending on the amount of water intake and lost

ANY QUESTIONS?

HOMEWORK • Read 985 - 998 • Study for Final