DIGESTION & NUTRITION. Nutrition . process by which organisms obtain and utilize their food 2 Parts: 1. ingestion- process of taking food into the digestive system so that it may be hydrolized or digested.
5.) METABOLIC/PHYSICAL ACTIVITY
** Fats contain more potential energy per each unit of their mass then any other major nutrient.
2. Saliva breaking the saltine down into molecules of glucose? -
3. Your tongue breaking pieces of a hamburger apart?
4. Pepsin (an enzyme) in your stomach breaking the hamburger into amino acids?
1. Maltose + water ----> simple sugars (glucose)
2. Proteins + water ---> amino acids
3. Lipids + water ---> 3 fatty acids + glycerol
Mouth – Ingestion occurs
Oral cavity – contains the teeth, tongue & openings for salivary glands
Teeth – mechanically breakdown food increasing surface area for chemical digestion by ENZYME action
Salivary glands – secrete Saliva (contains the enzyme amylase)
2 Facets of Saliva:
1. Moistens food for easier swallowing
2. Breaks down starches
Tongue – pushes food around in your mouth & into the esophagus
Esophagus – muscular tube that connects the pharynx with the next specialized section of the digestive tract – the stomach
Easier definition: The esophagus is simply a transportation tube from the mouth to the stomach. When we swallow, what we are really doing is closing a trap door in our throat called the epiglottis. This sends food down the esophagus and prevents food from going down the trachea (or windpipe) and into our lungs. Food moves down the esophagus using muscles NOT gravity.
1. Water - for hydrolysis
2. Mucus - lubricant for materials & protection of stomach lining
3. Hydrochloric acid (HCl) – strong acid (pH 1-3) which helps breakdown gastric protease (pepsin)
4. Pepsin – gastric protease (enzyme) which breaks down proteins
Broken into 3 Parts:
accessory structures such as the gall bladder and the pancreas, empty their secretions into the SI