Chapter 11: Digestive System Flashcards
(518 cards)
mouth
opening through which food passes into the body; breaks food into small pieces by mastication and mixing with saliva
tongue
consists mostly of skeletal muscle; attached in the posterior region of the mouth. it provides movement of food for mastication. directs food to the pharynx for swallowing and is a major organ for taste and speech
palate
separates the nasal cavity from the oral cavity
soft palate
posterior portion not supported by bone
hard palate
anterior portion supported by bone
uvula
soft V- shaped structure that extends from the soft palate; directs food into the throat
pharynx
performs the swallowing action that passes food from the mouth into the esophagus
esophagus
10inch tube that is a passageway for food extending from the pharynx to the stomach. peristalsis- involuntary wave like contractions the move food through the GI tract
stomach
J- shaped sac that mixes and stores food. it secretes chemicals for digestion and hormones that act locally to control digestive system functions
cardia
area around the opening of the stomach
fundus
proximal domed portion of the stomach
body
central portion of the stomach, distal to the fundus
antrum
distal portion of the stomach
pylorus
portion of the stomach that connects to the small intestine
pyloric sphincter
ring of muscle that guards the opening between the stomach and the duodenum
small intestine
20ft tube extending from the pyloric sphincter to the large intestine. digestion is completed in the small intestine. absorption, the passage of the nutrients from small intestine to bloodstream (happens in the villi of small intestines)
duodenum
first 10-12 inches of the small intestine
jejunum
second portion of the small intestine, about 8ft long
ileum
3rd portion of the small intestine, approx. 11ft long which connects with the large intestine
large intestine
approx. 5ft long tube that extends from the ileum to the anus. absorption of water and transit of the solid waste products of digestion take place in the large intestine
cecum
U-shaped pouch that is the first portion of the large intestine
colon
main portion of the large intestine. the colon is divided into 4 parts: ascending, transverse, descending, and sigmoid colon
rectum
distal portion of the large intestine, approx. 8-10in. long extending from the sigmoid colon to the anus
anus
sphincter muscle at the end of the gastrointestinal tract. provides for elimination of solid waste products of digestion