Digestive System Flashcards
What are the two groups of the digestive system?
Alimentary and accessory
What group of the digestive system digests food and absorbs materials?
The alimentary controls
What organs are in the alimentary group?
The GI tract, mouth, pharynx, esophagus, large intestines, and anus
What group of organs is technically outside the body?
The alimentary control organs
What organs are accessory?
Teeth, tongue, gallbladder, liver, pancreas, and salivary glands
What is ingestion?
Taking in good
What is propulsion?
Moving food through the body
What happens after you swallow?
Peristalsis
What is peristalsis?
The involuntary mechanism that’s triggered when you begin to swallow
What are the processes of mechanical digestion?
Chewing, mixing, churning, and segmentation
What are chewing, mixing, churning, and segmentation a part of?
Mechanical digestion
What is chemical digestion?
The breaking down of molecules using enzymes
What is absorption?
When chemicals are absorbed across the wall of lumen
What is defecation?
The elimination of indigestible materials
Describe digestive control
The careful control of something technically outside the body
What responds to stimuli?
The sensors in the walls of tract organs
What do sensors in the walls of tract organs do?
They respond to stimuli
What are the two types of receptors in the walls of tract organs?
Mechanoreceptors and chemoreceptors
What do sensors in the walls of tract organs control?
Stretching, osmolarity, pH, presence of substrates, and the end products of digestion
What’s in charge of stretching, osmolarity, pH, presence of substrates, and the end products of digestion?
Sensors in the walls of tract organs
What can activate or inhibit glands?
Sensors in the walls of tract organs
What allows digestive juices to flow into the intestines, and hormones to go into the blood?
Sensors in the walls of tract organs
What is intrinsic control?
Nerve plexuses, short reflexes, and long reflexes
What are short reflexes?
Intrinsic control of the local area/gut
What are long reflexes?
CNS enters/ extrinsic
What releases hormones?
Stimulation
Where are hormones released?
Into interstitial fluid
What can hormones affect?
The same or different digestive organs
What actions do hormones control?
Secretion and contraction
What controls secretion and contraction?
Hormones
What covers most digestive organs?
Visceral peritoneum
What does visceral peritoneum cover?
Most digestive organs
What lies in between the two parts of the peritoneum?
The peritoneal cavity
Where is the peritoneal cavity located?
Between the visceral and parietal peritoneums
What fills the peritoneal cavity?
Serous fluid
What does serous fluid fill?
The peritoneal cavity
What does serous fluid do?
It allows organs to move without damaging each other
What allows organs to move without damaging each other?
Serous fluid
What is the mesentery?
The double layer of peritoneum extending from the body wall
What is the the double layer of peritoneum extending from the body wall called?
The mesentery
What connects to the organs in the body cavity?
The mesentery
What does the mesentery connect to?
It connects to organs in the body cavity
What does the mesentery function as?
A route for nerves, vessels, and lymphatics
What functions as a route for nerves, vessels, and lymphatics?
The mesentery
What is the omenta?
The mesentery
What’s another name for the mesentery?
The omenta
What is the mesentery/omenta also called?
A ligament
What are all the names for the mesentery?
Omenta and ligament
What’s another location for the mesentery?
Retroperitoneal
What adheres to the abdominal wall posterior to the peritoneum?
The retroperitoneal
What are the two locations for the mesentery?
Peritoneal and retroperitoneal
What are retroperitoneal and peritoneal locations for?
The mesentery
What is the retroperitoneal attached to?
Parts of the pancreas and large intestine
What’s attached to parts of the pancreas and large intestine?
The retroperitoneal
What is splanchnic circulation?
Arteries that serve digestive organs
What are arteries that serve digestive organs a part of?
Splanchnic circulation
What is another name for splanchnic circulation?
Hepatic portal circulation
What is hepatic portal circulation?
Splanchnic circulation
What makes up 1/4 of all cardiac output?
Splanchnic circulation
What are the four tunica of the alimentary canal?
Mucosa, submucosa, muscularis externa, serosa
What are the mucosa, submucosa, muscularis externa, and serosa?
They’re the 4 tunics of the alimentary canal
What is the innermost layer of the alimentary canal?
The mucosa
What does the mucosa secrete?
It secretes mucus enzymes
What secretes mucus enzymes?
The mucosa
What does the mucosa absorb?
Nutrients
What absorbs nutrients?
The mucosa