Exam 4a Flashcards
What do the mucus neck cells and surface mucuous cells absorb?
Water, ions, short chain FA and some drugs
What is Alveolar Volume? (Va)
Volume of air involved with gas exchange
What is Deglutition?
Process of Swallowing
What enzymes are secreted by the pancreas?
trypsin,
chymotrypsin, pancreatic amylase, lipase,
nucleases
What do mucous cells secrete?
Secrete protective mucus
Describe teniae coli
Portions of the longitudinal muscle in the muscularis externa layerof the large intestine is thickened to form three bands
What is the reverse chloride shift? Why is this important?
1
Define hypoxia.
Oxygen Deficiency
What does diffusing capacity help explain?
Explains how easily a gas can diffuse during external and internal respiration
what are microvilli of the small intestine?
Numerous projections of the plasma membrane of absorptive mucosal cells. Provides further increase in surface area for absorption; digestive enzymes (brushborder enzymes) for some proteins and carbohydrates are housed here.
Describe the pancreas
pale pink lobulated gland located in the C-shaped region of the duodenum.
What are villi of the small intestine?
Finger-like projections of the mucosa
Describe the 3 major mechanisms that regulate blood pH.
- Buffer systems
- Exhalation of CO2
Respiratory system - Kidney excretion of H+
Urinary system
What is the respiratory membrane.
“Sheet” of blood covers the alveoli and membranes of all the terminal portions of the lungs
Describe the Sol Layer (Pericilliary liquid layer (PCL)) of the mucociliary transport system
The lubricant enables the gel mucus present at the tips of the cilia to be transported by the cilia
What is the function of the Submucosal Plexus?
Controlling secretions
List the four factors that result in a difference between the composition of alveolar air and atmospheric air.
- FRC (Functional Residual Capacity) gas is only partially replaced with atmospheric air with each breath
- Oxygen is constantly being absorbed into pulmonary blood
- Carbon dioxide is constantly diffusing from pulmonary blood
- Atmospheric air is humidified before reaching the alveoli
What is the pulmonary edema safety factor?
Left atrial pressure must reach >22.5 mmHg for the rate of pulmonary edema formation to increase linearly with left atrial pressure.
What does parasympathetic stimulation increase in the GI tract?
increases secretion and motility by stimulating ENS
The Pons contains the _______________ and ______________.
Pneumotaxic area and the Apneustic area
Describe the submucosa layer of the GI tract
underlying connective tissue contains numerous blood vessels and nerves
What is SpO2?
1
Define partial pressure.
Each gas in a mixture of gases exerts its own pressure as if all other gases were not present
The pressure of each gas alone is called the Partial Pressure
Why are small bronchioles clinically important as a site of resistance?
- No cartilage
- Abundant smooth muscle
- Contraction will reduce lumen radius
- Small lumen
- Edema and mucus will cause occlusion