The Chapter 8: Digestive system Flashcards
an/o
anus, ring
chol/e
bile, gall
cholecyst/o
gallbladder
col/o , colon/o
colon, large intestine
-emesis
vomiting
enter/o
small intestine
esophag/o
esophagus
gastr/o
stomach, belly
hepat/o
liver
-lithiasis
presence of stones
-pepsia
digest, digestion
-phagia
eating, swallowing
proct/o
anus and rectum
rect/o
rectum, straight
sigmoid/o
sigmoid colon
gastrointestinal tract
known as GI tract, digestive system, organs work in cooperation with accessory organs
upper GI tract
consists of the mouth, pharynx (throat), esophagus, and stomach
lower GI tract
referred to as bowels, made up of the small and large intestines plus rectum and anus
oral cavity
known as mouth, are lips, hard and soft palates, salivary glands, tongue, teeth, and periodontium
lips
known as the labia, surround the opening to the oral cavity
palate
which forms the roof of the mouth, consists of three major parts
hard palate
anterior portion of the plate, area covered with specialized mucous membrane
soft palate
flexible posterior portion of the palate, important role of closing nasal passage to prevent food and liquid from moving upward in nasal cavity
uvula
third part, hangs from the free edge of the soft palate, important role in snoring and in the formation of some speech sounds
tongue
very strong, flexible, and muscular; posterior portion of the tongue is attached, anterior end of the tongue moves freely and is flexible
papillae
upper surface of the tongue as dorsum, surface has a tough protective covering and in some areas, small bumps
sublingual surface
of the tongue and the tissues that lie under the tongue are covered with delicate highly vascular tissues
lingual frenum
a band of tissue that attaches the tongue tot he floor of the mouth
periodontium
describes the structures that surround, support and are attached to the teeth, consists of the bone of the dental arches and soft tissues
gingiva
known as masticatory mucosa or the gums, specialized mucous membrane that covers the bone of the dental arches and surrounds the neck of teeth
sulcus
an area of space between a tooth and the surrounding gingiva
dental arches
are bony structures of the oral cavity, arches hold the teeth firmly in position to facilitate chewing and speaking
maxillary arch
commonly known as the upper jaw and consists of bones of the lower surface of the skull; the arch does not move
mandibular arch
commonly known as the lower jaw, is a separate bone and is the only movable component of the joint
temporomandibular joint
known as TMJ, is formed at the back of the mouth where the maxillary and mandibular arches come together
dentition
refers to the natural teeth arranged in the upper and lower jaws
primary dentition
known as deciduous dentition or baby teeth, 20 teeth erupt during early childhood, normally lost during late childhood, replaced by permanent
occlusion
used in dentistry, describes any contact between the chewing surfaces of the upper and lower teeth
roots
of a tooth hold it securely in place within the dental arch
cementum
protects roots, hard substance, but it is not as strong as enamel
cervix
known as the neck of the tooth, where crown and root meet
dentin
make up the bulk of the tooth, portion that is above the gum line is covered with enamel
pulp cavity
area within the crown and roots of the tooth that is surrounded by the dentin to protect the delicate pulp of the tooth (pulp is space known as root canals)
pulp
consists of a rich supply of blood vessels and nerves that provide nutrients and innervation to the tooth
saliva
colorless liquid that maintains the moisture in the mouth (mechanical digestion) helps maintain health of the teeth
salivary glands
3 pairs, secrete saliva that is carried by ducts into the mouth
parotid glands
located on the face, slightly in front of each ear; inside of the cheek near the upper molars
sublingual glands
and their ducts are located on the floor of the mouth near the mandible
submandibular glands
and their ducts are located on the floor of the mouth near the mandible
pharynx
which is common passageway for both respiration and digestion
epiglottis
a lid-like structure that closes off the entrance to the trachea (windpipe) to prevent food and liquids from moving from the pharynx during swallowing
esophagus
the muscular tube through which ingested food passes from the pharynx to the stomach
lower esophageal sphincter
known as cardiac sphincter, a muscular ring between the esophagus and stomach; during swallowing it relaxes to allow food to enter the stomach
stomach
a sac-like organ composed of the fundus(upper, rounded part), body(main portion), and antrum(lower part)
rugae
are the folds in the mucosa lining of the stomach, allows stomach to decrease and increase in size, glands produce gastric juices
gastric juices
made up of enzymes and hydrochloric acid in the beginning of food digestion
pyloric sphincter
the ring-like muscles at the base of the stomach that controls the flow of partially digested food from the stomach to the duodenum of the small intestine
pylorus
the narrow passage that connects the stomach with the small intestine
small intestine
extends from he pyloric sphincter to the first part of the large intestine, consists of 3 sections where food is digested and nutrients are absorbed in bloodstream
duodenum
first portion f the small intestine, extends from pylorus of the stomach to the jejunum
jejunum
middle portion of small intestine, extends from duodenum to the ileum
ileum
which is the last longest portion of small intestine, extends from jejunum to the cecum of the large intestine
larges intestine
extends from the end of the small intestine to the anus
cecum
a pouch that lies on the right side of the abdomen, extends from the end of the ileum to the beginning of the colon
ileocecal sphincter
ring-like muscles that controls the flow from the ileum of the small intestine into the cecum of the large intestine
vermiform appendix
known as appendix, hangs from he lower portion of the cecum, consists of lymphoid tissue
colon
longest portion of the large intestine, subdivided into four parts
ascending colon
travels upward from the cecum to the undersurface of the liver
transverse colon
passes horizontally across the abdominal cavity from right to left toward the spleen
descending colon
travels down the left side of the abdominal cavity to the sigmoid colon
sigmoid colon
an S-shaped structure that continues from the descending colon above and joins the rectum below
rectum
the widest division of the large intestine, makes up the last 4 inches of the large intestine and ends at the anus
anus
lower opening of the digestive tract, flow of waste through the anus is controlled by the internal anal sphincter and the external anal sphincter
anorectal
refers to the anus and rectum as a single unit
accessory organs
digestive system are so named because they play a key role in the digestive process but are not part of the gastrointestinal tract
liver
largest organ in the body, several important functions related to removing toxins from the blood and turning into fuel and nutrients the body needs
hepatic
means pertaining to liver
glycogen
form of glucose that is stored in the liver and muscles
bilirubin
a pigment excreted into the digestive fluid called bile, giving it a yellow to green color
bile
aids in the digestion of fats, a juice secreted by the liver that is necessary for the digestion of fat, travels from the liver to the gallbladder where it is stored
biliary
tree provides the channels through which is transported from the liver to the small intestine
gallbladder
a pear-shaped organ about the size of an egg located under the liver
cholecystic
pertaining to the gallbladder
pancreas
a soft, 6-inch long, oblong gland that is located behind the stomach
digestion
process by which complex foods are broken down into nutrients in a form the body can use
digestive enzymes
are responsible for the chemical changes that break foods down into simpler forms of nutrients for use by the body
nutrient
a substance, usually from food, that is necessary for normal functioning of the body
metabolism
includes all of the processes involved in the body’s use of nutrients
anabolism
the building up of body cells and substances from nutrients
catabolism
the breaking down of body cells or substances, releasing energy and carbon dioxide
absorption
the process by which completely digested nutrients are transported to the cells throughout the body
villi
mucosa the lines the small intestine is covered with finger-like projections, containing blood vessels and lacteals
lacteals
specialized structures of the lymphatic system, absorb fats and fat-soluble vitamins that cannot be transported directly by the bloodstream
mastication
known as chewing, breaks food down into smaller pieces, mixes it with saliva, and prepares it to be swallowed
bolus
a mass of food that has been chewed and is ready to be swallowed
peristalsis
a series of wave-like contractions of the smooth muscles in a single direction that moves the food forward into the digestive system
chyme(KYM)
the semifluid mass of partly digested food that passes out of the stomach, though the pyloric sphincter, and into the small intestine
emulsification
must be completed before the nutrients can be absorbed into the body
feces
known as solid boy wastes, expelled though the rectum and anus
defecation
known as bowel movement (BM), is the evacuation or emptying of the large intestine
gut microflora
refers to the billions of normal bacteria present in the large intestine to protect against infection and help maintain the immune system