Exam 2 - Topic 2 - Homeostasis Flashcards
1
Q
Homeostasis
A
- maintenance of nearly constant conditions in the internal Enviornment
- what a perfusionist does
2
Q
Molecules that easily diffuse
A
- H2O
- O2
- CO2
- N
3
Q
Molecules that do not easily diffuse
A
- Large molecules
- Proteins
- charged/polar molecules
4
Q
Relative protein [ ]’s
A
- Highest in cell - then blood - then ECF
5
Q
How body controls blood flow across organ systems?
A
- Since pressure remains constant….resistance is changed by body to alter flow
- constrict / dilate arterioles and other vessels
6
Q
Body water
A
- 60% of body weight
- Intracellular compartment
- hold 2/3 of water / includes volume in all RBC - Extracellular compartment
- This is the internal environment
- Interstitial / plasma / transcellular
7
Q
ECF
A
- Extracellular fluid
- function is transportation
- contains:
Ions / amino acids / fats / O2 / glucose
8
Q
Location of cells relative to capillaries
A
- Very close
- Almost all cells
9
Q
Body water compartment %’s
A
Intracellular
- 40% body weight
- 67% body water
Extracellular
- 20% body weight (4 in plasma - 16 in interstitial)
- 33% body water (7 in plasma - 26 in interstitial)
10
Q
Ion [ ] ‘s in compartments (outside and inside cell)
A
Na: 142 out / 10 inside K: 4 out / 140 inside Ca: 2.4 out / 0.0001 inside Mg: 1.2 out / 58 inside Cl: 103 out / 4 inside - All in mEq/L
11
Q
Origin of nutrients
A
- Respiratory: O2
- GI System: Carbs, fats, amino acids
- Liver/fat cells/GI mucosa/kidneys/endocrine:
Transform substances into usable form
Store substances for later use
12
Q
Removal of metabolic end products
A
- Respiratory: CO2
- Renal system: urea / excess ions / excess water
- GI tract: undirected material
- Liver: toxic substances / other waster products
13
Q
Distribution of blood flow
A
Heart - 3% Brain - 14% Muscle - 15% Bone - 5% Liver - 27% (6% from arterial / 21% from GI portal) Kidney - 22% Skin - 6% Bronchi - 2%
