Saladin Ch25: The Digestive System Flashcards
What are 3 alternate names for the digestive system/tract?
Alimentary, enteron, and gastrointestinal
What is the length of the GI tract in a living person and cadaver?
5m/16ft and 9m/30ft
What is the name of the tissue covering the digestive organs?
peritoneum
What is the process of chemical digestion that breaks down carbs, fats, and protein?
hydrolysis
What two muscles define the oral cavity?
buccinator and orbicularis oris
What is an alternate name for the oral cavity?
buccal cavity
What is the space between the gums and the lips?
vestibule
What is the connection between the upper lip and gums?
superior labial frenulum
What are the involutions of the hard palate?
Friction ridges
What is the connection for the tongue on the inferior side?
lingual frenulum
What are the two salivary duct orifices?
Sublingual and submandibular
What is the connection between the lower lip and gums?
inferior labial frenulum
What type of tissue covers the tongue?
non-keratinized stratified squamous epithelium
What are the 3 types of lingual papillae?
Filliform, fungiform, and vallate
What is the alternate name for “taste”?
gustation
What is the nerve that innervates the anterior 2/3rd of the tongue?
facial (VII)
What is the nerve that innervates the posterior 1/3rd of the tongue?
glossopharyngeal (IX)
What are the bones that constitute the hard palate?
maxilla and palatine bones
What is the alternate name for “teeth”?
dentition
What is the term that describes varying sizes of teeth?
heterodont
What is the term that describes mammals who have two sets of teeth during a lifetime?
diphyodont
What is the term for the socket in which a tooth sits?
alveolus
What is the term that describes mammals whose teeth sit in sockets?
thecodont
What is the type of join that holds teeth in the alveolus?
gomphosis
What is the alternate name for the gum?
gingiva
What is the space where the tooth and gum meet?
gingival sulcus
What is the hard yellowish tissue that makes up the majority of the tooth?
dentin
What is the covering of the tooth above the gum?
enamel
What is the covering of the tooth below the gum?
cementum
What are two areas of tooth that contains arteries, veins, nerves, and loose connective tissue?
Pulp cavity and root canal
What is the pore through which nerves and vessels enter and exit the tooth?
apical foramen
What is the connective tissue that lines the alveolus and penetrates the cavity and tooth to hold it in place?
periodontal ligament
What are the 3 sets of salivary glands?
parotid, submandibular, sublingual
What is the component of saliva that breaks down starch?
salivary amylase
What is the component of saliva that breaks down lipids?
lingual lipase
What is the antibacterial enzyme found in saliva and what is its function?
IgA; it inhibits bacterial growth
What are the electrolytes found in saliva?
Na, K, Cl, HCO3
What muscle type is the pharynx composed of?
striated skeletal muscle
What is the opening in the diaphragm through which the esophagus passes?
esophageal hiatus
What are the 4 layers of the esophageal wall?
mucosa (inner), submucosa, muscularis externa, and serosa
What are the 3 layers of the mucosa?
stratified squamous epithelia, lamina propria, muscularis mucosae
What are the two muscle layers of the muscularis externa and what type of muscle are they?
inner circular, outer longitudinal, both are smooth muscle
What muscle types make up the length of the esophagus?
upper 1/3rd is skeletal, lower 1/3rd is smooth
What are the two parasympathetic nerve plexuses of the enteric nervous system?
submucosal (meissner) and myenteric (auerbach)
What is an alternate name for swallowing?
deglutition
What is the region of the brain that controls swallowing reflex?
medulla oblongata and pons
What is the term for food mixed with gastric secretions?
chyme
What are the actions of swallowing that are voluntary?
mouth closes, then tongue presses against the palate