Notes page functions of the digestive system single cell digestive system simple gut one cavity complete tube sketch earthworm & label (next side of page) (leave space for each) grinding parts digestive enzymes absorption water removal elimination
Digestive System The point of the digestive system: take in nutrients absorb nutrients eliminate wastes It’s all about ATP!!
Type 1: (Earliest) Single Cell LYSOSOMES are “bubbles” in the cell that contain enzymes LYSIS means to “break” Enzymes do HYDROLYSIS: Break down larger particles
Cell Digestion using lysosomes “PHAGOCYTOSIS” = “CELL EATING”
Type 2: Simple Gut, one cavity One opening for entry & exit Gastrocavity
Type 3: COMPLETE TUBE: Mouth for entry Anus for exit of waste Tube based intestines for absorption
Worms (Platys) thru Humans!
Worms thru Humans Arthropods
First line of digestion: Mouth, Teeth Teeth physically break up food Saliva: breaks down sugars Animals without teeth have “gizzards” to grind up food!
Esophagus: tube for eating “phage” means “to eat” Expandable, muscular Movement through digestive system = “PERISTALSIS”
How carbon monoxide kills: Carbon monoxide binds to hemoglobin TIGHTER THAN OXYGEN CAN One carbon monoxide is in the blood, it can’t come out Your body can’t use carbon monoxide to make ATP You die from lack of ATP
Diseases of digestive system: ULCERS: caused by bacteria attacking stomach lining NOBEL PRIZE!
Diseases of digestive system Eating Disorders ANOREXIA BULEMIA ETC. Immune System CROHN’S DISEASE IRRITABLE BOWEL
Diseases of digestive system Food poisoning: bacterial!!! NOROVIRUS: viral stomach flu Both spread from contaminated food when someone sick prepares food Often in dorms, cruise ships hotels.
Diseases of circulatory system Heart attack: clot in coronary arteries causes heart muscle to die If muscle area is big enough, person can die. Fatty foods can cause narrowing of arteries
Diseases of circulatory system Artherosclerosis : “artery hardening”: Arteries fill with cholesterol & fat, narrowing channel Then clot can cause blood stoppage, stroke, death
Diseases of circulatory system Babies can be born with hole in septum, allows non-oxygenated blood through to body.
Diseases of blood cells: Leukemia: cancer of white blood cells (too many of them, and they don’t work properly)
Anemia: not enough red blood cells
Iron supplements to help make hemoglobin
Bone marrow transplants
Bone marrow transplants:
Heart transplants Use a machine to pump blood temporarily