Physiology Week 1 Flashcards
ICF is found where? ECF?
ICF: within the cell
ECF: bathes and surrounds the cells
Another word for homeostasis that describes a stable internal environment
Dynamic equilibrium
What are the cells requirements?
Maintain functional integrity, perform organ function, and contribute to organism’s survival
Define homeostasis.
Ability of the body to maintain a relatively stable internal environment despite external variances
Maintenance of steady states in the body by coordinated physiological mechanisms
Total volume of body water and its distribution
42L total
2/3: intracellular (40%)
1/3: extracellular (20%);
3/4: interstitial/lymph
1/4: plasma
Note: water is 50% and 60% of body weight for women and men, respectively
What is transcellular fluid?
Fluids outside of normal compartments; I.e. CSF, digestives fluids, and mucus
Sodium extracellular electrolytes range
136-145 mmol/L (mEq/L)
Potassium extracellular electrolyte range
3.5 - 5 mmol/L (mEq/L)
Intracellular sodium range
6 - 14 mmol/L (mEq/L)
Intracellular potassium electrolyte range
154 mmol/L (mEq/L)
Osmolarity of body fluid compartments
290 mOsm
Homeostasis requires __________, while equilibrium does not
Energy expenditure
What is steady state?
Maintenance of a state that does not change with time that usually required energy expenditure
Define equilibrium
Two compartments that have the same amount and free energy; bonnet energy transfer between compartments
What is the relationship between steady state and homeostasis?
Steady state is the means by which homeostasis is maintained
