Digestive! Flashcards
digestive system =
gastrointestional system
digestive tract =
alimentary tract
GI tract
alimentary canal
why is food vital?
contains nutrients
source of energy
food containing nutrients have molecules that are needed for building new bosy tissues, repairing damaged tissues, and sustaining needed ….
chemical reaction
6 steps to get nutrients from food -
ingest masticate digest secrete absorb eliminate
taken into the mouth -
ingest
chew -
masticate
physical and chemical changes to break food into small molecules -
digest
enzymes, water, acids, and buffers needed for digestion -
secrete
small usable nutrient molecules must then must then be passed through cells into the blood and lymph system
absorb
excretion of materials not absorbed through defecation
eliminate
the sum of all chemical reactions in the body -
metabolism
the digestive system is composed of …….
digestive tract
acessory digestive structures
it is composed of the mouth, pharynx, esophagus, stomach, small int, large int, rectum, anal canal, and anus
digestive tract
it is composed of teeth, lips, tongue, cheeks, salivary glands, pancreas,liver, and gallblader
accessory digestive structure
its also called oral or buccal activity -
mouth
food is masticated -
mechanical digestion
cheeks are lined w …….
…….
lateral boundaries of the oral cavity -
cheeks
regions of the teeth -
crown
neck
root
its the hardest substance in the body -
crown
it makes up the greatest portion of the tooth shell
- covered by enamel in the crown
- covered by cementum in the neck and root areas
- complex structure of organic and inorganic materials
dentin
it contains nerves and blood vessels -
pulp cavity
its just external to dentin
-helps hold tooth in -
cementum
just external to cementum
-helps hold tooth in -
periodontal ligaments
3 problems and procedures -
cavity
gingivitis
root canal
bacterial, epithelial cells, white cells bacteria release acid that attack the enamel -
dental plaque
the inflammation of the gums
due to poor hygiene, bleeding gums, receding gum line
may result in tooth loss
gingivitis
it forms the anterior portion of the roof of the mouth
-ridged surface against which food is crushed and softened before swallowing -
hard palate
it forms the posterior portion of the roof of the mouth, extending between the oral and nasal portions of the pharynx
-prevents food from being forced into the nasal cavity
soft palate
a finger-like muscular projection of soft palate
-helps keep food from entering the nasal passages while swallowing
uvula
it is a solid mass of skeletal muscle -
tongue
the tongue functions in …..
mechanical digestion
front part of the tongue is used for …..
food during chewing
the ….. base aids in swallowing or deglutition
tongue
the …… helps to anchor the tongue to the floor of the mouth -
lingual frenulum
the ….is attached to the hyoid bone, mandible, styloid, processes, and pharynx
tongue
w the weight of the tongue on the hyoid, people are able to …
articulate
salivary glands refers to the ……. pairs of glands involved in salivation-
3 largest
saliva contains 99% ……… salts and ……..
water
salivary amylase
its the enzyme that breaks down carbs
amylase
3 salivary glands -
parotid
sublingual
submandibular
they are the largest
- in front of ears covering part of masseter
- mumps are caused by the swelling of this gland
parotid glands
viral disease characterized by the swelling of these glands -
mumps
they are the smallest,
floor of mouth beneath the tongue -
sublingual glands
beneath base of tongue in the posterior part of the floor of the mouth -
submandibular glands