Science 12.1 (The different organs of digestion)

• The mouth where the food enters.
• A posterior opening called the anus where the undigested residue called fecus exits.
• The digestive system consist s of the organs of the alimentary tract - mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus.
• The other organs of the digestive system are the different glands that are important in the digestive process -the liver; the pancreas: and salivary, gastric, and intestinal glands. They're considered the accessory organs of digestion.
• The mouth or buccal cavity ingests the foodd.
• Teeth breaks down food into smaller pieces
• The muscular tongue that enables us to taste food.
• The salivary glands located within the mouth, and helps us swallow the partly digested food.
• The saliva contains the salivary amylase, also knows as ptyalin.
• Food that is chewed and lubricated is changed into a ball-shaped mass called bolus.
• Swallowing pushes the bolus into the pharynx or throat that is located posterior to the mouth.
• The swallow reflex raises the flap of muscles called the epiglottis to cover the opening of the trachea.
• The esophagus is the muscular tube that conveys food from the pharynx to the stomach.
• A wavelike contraction called peristalsis facilitates the movement of the bolus down the different organs of digestion.
• The stomach is the pear-shaped organ that is connected to the distal end of the esophagus.
• The small intestine is a long, coiled tube that fills the abdomen.
• The large intestine, also called the colon, is the organ next to the small intestine.
• The rectum serves as warehouse for undigested residue feces.
• Gastroenterologist are doctors who specialize in diagnosing and treating problems of the gastrointestinal tracts and the liver.