Test #7: Digestive & Reproductive Systems Flashcards
What organs are in the Upper Right Quadrant of the abdominopelvic cavity?*
Liver, gall bladder, and part of the small and large intestines
What organs are in the Upper Left Quadrant of the abdominopelvic cavity?*
Stomach, spleen, pancreas, and part of the small and large intestines
What organs are in the Lower Right Quadrant of the abdominopelvic cavity?*
Urinary bladder, reproductive organs, and part of the small and large intestines
What organs are in the Lower Left Quadrant of the abdominopelvic cavity?*
Urinary bladder, reproductive organs, and part of the small and large intestines
What is another name for the gastrointestinal tract?
GI tract or alimentary canal
What is the GI tract?
A continuous tube which is open to the outside of the body.
It begins with the mouth, then continues to the pharynx, esophagus, stomach, small intestine, large intestine, rectum and anus.
How many functions of the digestive system?
6 functions
What are the 6 functions of the digestive system?*
- Ingestion; 2. Propulsion; 3. Mechanical digestion; 4. Chemical digestion; 5. Absorption; and 6. Defecation
Ingestion
The process of taking food into the mouth.
Propulsion
The movement of food through the GI tract.
Vocab: Deglutition
“Swallowing”
Vocab: Peristalsis
A slow, rhythmic contraction of smooth muscle to move food along.
Mechanical Digestion
The physical breakdown of food into smaller pieces
What are the 3 methods of mechanical digestion?
- Mastication; 2. Churning; and 3. Segmentation
Mechanical Digestion: Mastication
“Chewing”
Mechanical Digestion: Churning
Breakdown of food into smaller pieces in the stomach.
Mechanical Digestion: Segmentation
A slower form of peristalsis which is designed to keep food in place as it is being broken down.
Chemical Digestion
The addition of enzymes and digestive juices to further breakdown food chemically.
Absorption
The uptake of nutrients from our diet through the mucosal lining of the GI tract. 90% occurs in the small intestine.
Defecation
The elimination of waste in the form of feces through the anus.
Mouth
Ingestion occurs here.
What are the 3 parts of the mouth?
- Teeth; 2. Tongue; and 3. Salivary glands
Mouth: Teeth
Shred, grind and tear food into smaller pieces.
Mouth: Tongue
Made up of skeletal muscle, taste buds and mucus producing glands.
It allows for a sense of taste and positions food for ease of chewing and swallowing.
Mouth: Salivary Glands
Product saliva which is a byproduct of blood.
It is 97-99% water with electrolytes, proteins, antibodies, digestive and antibacterial enzymes, and metabolic waste.
What are the 3 salivary glands?
- Submandibular; 2. Sublingual; and 3. Parotid
Salivary Glands: Submandibular
Located on the medial side of mandible
Salivary Glands: Sublingual
Located under the tongue
Salivary Glands: Parotid
Lie anterior to the ear, deep to the skin and superficial to the masseter muscle.
What are the 3 functions of saliva?
- Cleanses the mouth due to antibacterial enzymes and antibodies.
- Moistens food so it can be tasted.
- Moistens food so it can be compacted into a ball for ease of swallowing.
What are the 5 functions of the mouth?
- Ingestion; 2. Mechanical digestion (mastication); 3. Chemical digestion; 4. Absorption; and 5. Propulsion (deglutition)
What are the 4 muscles involved in mastication?
- Temporalis; 2. Masseter; 3-4. Medial and Lateral Pterygoids
Temporalis*
A: ELEVATES THE MANDIBLE
O: Temporal fossa
I: Mandible
Masseter*
A: ELEVATES THE MANDIBLE
O: Maxillae (under zygomatic arch)
I: Mandible
Medial Pterygoids*
A: SIDE-TO-SIDE DISPLACEMENT OF THE MANDIBLE
O: Maxillae
I: Mandible (Oblique angle)
Lateral Pterygoids*
A: SIDE-TO-SIDE DISPLACEMENT OF THE MANDIBLE
O: Sphenoid
I: TMJ (Horizontal/deep)
What muscles of mastication are indicated for “clenchers”?
Temporalis and masseter
What muscles of mastication are indicated for “grinders”?
Medial and lateral pterygoids
Mouth: Chemical Digestion
Salivary amylase is the enzyme in saliva which begins the breakdown of complex carbohydrates into simple carbohydrates. It is not a complete breakdown.
Saliva creates a bolus – a moistened ball of food for ease of swallowing.
Mouth: Absorption
Sublingual medications, such as nitrous oxide, can be absorbed in the mouth.
Mouth: Propulsion
Deglutition is the the swallowing of the bolus.
Pharynx
The “throat” is a ~5” length tube of skeletal muscle.
It delivers the bolus from the mouth to the esophagus.
Esophagus
About 10” in length, it runs down the mediastinum and through the diaphragm.
Made up of some skeletal muscle and mostly smooth muscle.
It rhythmically contracts (peristalsis) to move the bolus to the stomach.
What are the 4 layers of the GI tract (from deep to superficial)?
- Mucosa; 2. Submucosa; 3. Muscularis; and 4. Serosa
Mucosa
Epithelial tissue innermost lining in contact with food.
What are the 3 functions of mucosa?
- Protection; 2. Absorption; and 3. Secretion
Mucosa: Protection
The tightly packed epithelial cells and sticky mucus protect against foreign matter.
Mucosa: Absorption
In some areas of the GI tract, the mucosa absorbs nutrients and medications into the blood.
Mucosa: Secretion
In some areas of the GI tract, the mucosa secretes digestive enzymes and juices.
Submucosa
A layer of connective tissue outside the mucosa that serves as a pathway for blood vessels, nerves, lymphatics, and it is the location of phagocytes.
Muscularis
Smooth muscle layer outside the submucosa that is responsible for peristalsis, segmentation and churning.
Serosa
Superficial layer of connective tissue which helps to anchor the GI tract.
Stomach
ULQ: A collapsible storage tank for food that can shrink down to 1-2” in diameter and can expand to hold about 1 gallon.
What are the 4 parts of the stomach?
- Cardiac region; 2. Fundus; 3. Body; and 4. Pylorus