Digestive System Flashcards
Digestive system starts with
Oral cavity
Digestive system ends with
Anal canal
What are the processes of providing nutrients needed for cells by the digestive system?
Ingestion
Digestion
Absorption
Excretion
Ingestion
Intake of food
Digestion
Mechanical and chemical breakdown of food.
Absorbtion
Process of extracting nutrients
Elimination
Excretion of any waste products.
Other names for digestive system
Gastrointestinal tract (GI) Alimentary canal
2 Main parts of the digestive system
Stomach
Intestines
Alimentary canal refers to
Tubelike nature of the digestive system which starts at the mouth and ends at the anus
The digestive system passes through
Thoracic cavity in the mediastinum
Diaphragm in the abdominopelvic cavity
Four coats of the alimentary canal
Mucosa (most inner)
Submucosa
Muscularis
Serosa (most outer)
Aliment/o
Nutrition
Mucosa purposes:
Secretes gastric juices.
Absorbs nutrients.
Protects the tissues by producing mucus.
Mucus
Thick slimy emissions
The inner tunic is lined with :
How many layers? What kind? What are they attached to?
1 layer
Epithelial tissue
That is attached to lamina propria
Lamina propria
Plate like Layer of connective tissues that is attached to the mucosa
Tunic
Layer
Submucosa holds
Blood
Lymphatic and nervous tissues
Submucosa purpose
Nourish
Protect
Communicate
Muscularis consists of?
How many layers? Of what?
2 layers of circular and longitudinal muscles
Peristalsis
When the circular and longitudinal muscles in the muscularis contract and relax in a wavelike movement
Outermost tunic name depends on?
Whether it’s within or outside the peritoneal cavity
Adventitia (tunica exerta)
Outer tunic is outside peritoneal cavity
Tunica externa purpose
Binds the structure together and
Serosa
Tunic is within peritoneal cavity
Serosa purpose
Emit a slippery fluid to counteract friction
Mucosa also contains some
Muscularis mucosa
The digestive function of oral cavity is
Break down food by mastication
Lubricate food to make deglutition easier
Mastication
Chewing
Deglutition
Swallowing
Lips
The beginning of the oral cavity, 2 fleshy structures surrounding it’s opening
Labium superioris
Upper lip
Labium inferiors
Lower lip
Cheeks are covered by … on the outside and …. on the inside and ….. in between
Skin
Mucous membrane
Muscles, fat, nerves, glands
What are the glands that secrete mucus in oral cavity
Buccal
Molar
Palatine
Labial
Buccal glands are located
Throughout inner cheek wall
Molar cheeks are located
On the cheeks near back teeth
Tongue
Muscular organ in oral cavity responsible for tasting, chewing, swallowing and speaking
The tongue is attached in the. Front To the floor of the mouth by the….
Frenulum lingua
Frenulum lingua
Small fold of tissue under the tongue that attaches it to the floor of the mouth.
Tongue is attached in the back to the
Hyoid bone
Tongue is coated in …. membrane
Mucous
Papillae
Thousands of tiny projections studded in the mucous membrane covering the tongue
Where are taste buds
Between the papillae
What are tastebuds
Nerve like cells with receptors for the 5 known tastes
5 known tastes
Sweet Salty Bitter Sour Savory(umami)
Tonsil
Lymphatic tissue located at the base of tongue that serves a protective function
What are tonsils protecting against
Pathogens attempting to enter via the mouth
The posterior of the mouth roof is
Soft palate
Anterior of mouth roof is
Hard palate
Uvula
Tag of flesh hanging Down from the medial surface of the soft palate
Uvula purpose
Production of speech and the initiation of the gag reflex
Maxilla
Upper jaw
Mandible
Lower jaw
Gingivae
Fleshy gums
There are 32 teeth set in the gingivae of the
Alveolar ridges of each bone
Saliva purpose
Moistens the oral cavity and aids in chewing and swallowing
Saliva begins the chemical digestive process by initiating
The digestion of starches
There are … pairs of salivary glands named after….
3
Their location
Parotid gland is located
Near the ear
Submandibular gland is located
Under the lower jaw
Sublingual gland is located
Under the tongue
Maxill/o
Upper jaw
Mandibul/o
Lower jaw
Dent/i
Teeth
Odont/o
Teeth
Gingiv/o
Gums
Bi
Two
Pre
Before
Periodental تحليل كلمي
Peri: surrounding
Odont/o: teeth
Al: pertaining to
Sialoaden/o
Salivary gland
Sial/o
Ptyal/o
Saliva
Pharynx
Throat
Passageway that connects the oral and nasal
The pharynx is divided to
3
Nasopharynx
Oropharynx
Hypopharynx
Nasopharynx is located
Behind nasal cavity
The most superior part of the pharynx is
Nasopharynx
Oropharynx is located
Directly adjacent to the oral cavity
Hypopharynx another name is … and why
Laryngopharynx
Because it’s proximity to the larynx
Larynx
Voice box
Parotid تحليل
Par: near
Ot/o: ear
Id: pertaining to
Submandibular
Sub: under
Mandibul/o: low jaw
Ar: pertaining to
Sublingual
Sub: under
Lingu/o: tongue
Al: pertaining to
Pharyng/o
Pharynx
Nasopharynx
Nas/o: nose
Pharyng/o: pharynx
Oropharynx
Or/o: mouth
Pharyng/o: pharynx
Hypopharynx
Hypo: below
Pharyng/o: pharynx (throat)
Laryngopharynx
Laryng/o: larynx حنجرة
Pharyng/o: pharynx
Esophagus
بلعوم
Muscular, mucus lined, 12-inch tube that extends from the throat to the stomach and carries a bolus from the Oral cavity to the stomach by peristalsis
Bonus
Masticated lump of food
Peristalsis
Wave like muscle contractions that move food through the digestive track
The glands in the lining of esophagus produces ? And what is it’s function
Mucus
Lubricate bolus and ease it’s passage
The muscle that must relax before the food enters the stomach is called?
Lower esophagus sphincter OR cardiac sphincter OR gastroesophageal sphincter
Why is it called the cardiac sphincter?
Because it’s proximal to the heart
Sphincter
Ring like muscles that appear throughout the digestive system and other systems as well. These muscles could move voluntary and non voluntary.
Peritoneum
Double sided membrane that holds many of the organs in the abdominopelvic cavity
Parietal peritoneum
The outer side of membrane near the body wall
Visceral membrane
Inner side of membrane near the organs
Visceral peritoneum
Inner side of membrane near the organs and it is the serosal layer that coats the abdominopelvic viscera with it’s serous fluid facilitating movement between organs.
Ascites
Abnormal accumulation of peritoneal fluid in the Abdominopelvic cavity.
Organs that lie in the retroperotoneum (behind the peritoneum) are
5
Pancreas Aorta Kidneys Ureters Duodenum
Structures that help intraperitoneal organs with support and supplying are
Mesenteries
Ligaments
Folds
Mesenteries
Extensions of the visceral peritoneum that stretch out to hold many of the abdominal organs and they serve as channels for blood vessels, nerves, lymphatic vessels travelling to and from organs.
Mesocolon
Mesoappendix
Mesenteries that surround the colon
Mesenteries that surround the appendix
Ligaments and folds purpose
Provide support and attach one structure to another
Omentum
curtain of fatty tissue that hangs down from the stomach and liver and wraps around the intestines
Stomach
Expandable sac like vessel located between the esophagus and intestines
How does the stomach begin digestion
By storing swallowed food and mixing it with gastric juices and hydrochloric acid to further digestion chemicaly
Chyme
Partly digested food mixed with gastric juices and hydrochloric acids
The smooth muscles in the stomach contract to …
Aid in the mechanical digestion of food
Why is there a mucus coating on the stomach walls
To protect the stomach and other parts of the digestive system from the acidic nature of gastric juices
Three main parts of stomach
Fundus
Body (corporis)
Pylorus (gastric antrum)
Antrum
Cavity or chamber
Fundus
Area of stomach that abuts the diaphragm. This area doesn’t have any acid producing cells
Body, corporis
Central part of the stomach
Plural of pylorus
Pylori
Pylorus
Distal part of the stomach where small intestines begin
Pylorus is divided into
Pyloric antrum
Pyloric canal
Pyloric sphincter
Pyloric sphincter function
Regulates the gentle release of food from the stomach into the small intestine
Cardia is
The portion of stomach that surrounds the esophagogastric connection
Ruga (pl:rugae)
Ridges lining the stomach when it’s empty
Fund/o
Fundus
Corpor/o
Body
Pylor/o
Pylorus
Antr/o
Antrum
The first part of the small intestine is
Duodenum