_____ 1st Hour Team Ebby ______ Digestive System _____ 1st Hour Team Ebby ______

Include the following on your slide: Name of organ Description of structure Function of organ Identify if there is mechanical &/or chemical digestion occuring Picture of the organ Identify any secretions produced Function of secretions Use only 1 slide. Make sure it is neat & easy to read.

Mouth The opening part of the human face The mouth is the beginning of the digestive tract; and, in fact, digestion starts here when taking the first bite of food. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use. The salivary glands produce saliva, which keeps the mouth and other parts of the digestive system moist Enzyme in saliva, Amylase - breakdown starch

Pharynx cavity behind nose and mouth connects to esophagus part of both the respiratory tract and the digestive tract nasopharynx, oropharynx, and laryngopharynx epiglottis directs the travel of air or food into either the larynx or the esophagus

Esophagus Structure: a muscular tube connecting the pharynx with the stomach Function: to carry food, liquids, and saliva from the mouth to the stomach Digestion: mechanical digestion through peristalsis, a wavelike movement to move food down the esophagus Secretion: mucus Function of Secretion: for lubrication, to minimize friction and allow smooth movement down the tube

Stomach C-shaped organ between the esophagus and the small intestine in the GI tract Made up of 3 layers of muscle and covered in thick mucus Stomach stores food, breaks it down, and moves it to the small intestine through propulsion Mechanical Digestion: churning and peristalsis Chemical Digestion: pepsin- breaks down protein Gastric juice Secretion stimulated through neural and hormonal factors Gastrin stimulates pepsinogen, mucus, and hydrochloric acid production

Small Intestine Where part of digestion occurs, absorption of nutrients occurs in small intestines About 23 feet long in adult Mechanical and chemical digestion Mechanical - peristalsis and segmentation Chemical - enzymes break down proteins, lipase breaks down fats Secretes water and mucus and help protect intestines and help food move easier

Large Intestine Larger in diameter than the small intestine, but shorter in length Major functions: to dry the indigestible food residue by absorbing water and to eliminate these residues from the body as feces Has 3 subdivisions: cecum, appendix, colon, rectum, and anal canal No villi are present, but there are many goblet cells in its mucosa that produce alkaline mucus Mucus acts as a lubricant to ease the passage of feces 3 bands of muscle called teniae coli

Liver Largest gland in the body, comprised of lobes suspended beneath the diaphragm. Function: Produces bile that enters the small intestine, the bile salts break down fat globules. Mechanical digestion occurs due to large fat globules being broken into smaller pieces. Bile is secreted into the gallbladder (where it is stored) This breaks down the fat in the digestive tract

Gallbladder Is a green pea-pod like shape, located inferiorly to the liver and laterally to the pancreas Function: to store the bile made from the liver Bile breaks down fat No mechanical or chemical digestion occurs here

Pancreas Soft , Pink Triangular gland that extends across the abdomen from the spleen to the duodenum. Function: Converting the food we eat into fuel for the body’s cells. Digestion: an exocrine function that helps digestion and an endocrine function that regulates blood sugar. Pancreas are secreted into the duodenum in an alkaline fluid (bicarbonate) that neutralizes the acidic chyme coming in from the stomach.

The final section of the large intestine, terminating at the anus. Rectum = The End