Lecture 1 Homeostasis and Cell function Flashcards
Stress is any
stimulus that creates an imbalance in theinternal environment.
Define homeostasis and explain its significance to understanding physiological processes.
maintenance of nearly constant conditions in the internal environment
based on what the body is doing at that time, ie. running a marathon
ll organs and tissues of the body perform functions that help maintain these relatively constant conditions.
an organism is said to be at homeostasis when?
its internal environment is at an optimal temp, pressure, concentrations of ions, gases, nutrients, water
•Which cation is most abundant in the extracellular fluid?
Na
•Which cation is most abundant in the intracellular fluid?
K
•Which anion is most abundant in the extracellular fluid?
intracellular
Cl-
PO4 3-
negative feedback basically means the effects are ________ or negative with respect to the initiating stimulus?
Opposite.
Gain of a Control system is?
the degree of effectiveness with which a control system maintains constant conditions, is determined by the gain of the negative feedback.
Gain equation is ? define its terms as well
Correction/ Error
Correction is the Final corrected value - initial abnormal value
Error is the Final corrected value - initial normal value
BP normal 100, abnormal 175, corrected 125
-50/25
3 positive feedback loops?
Clotting, uterine contractions (cervix stretching) and nerve signals
A homeostatic mechanism is made up of ________ responses.
adaptive
For the Gain of a controlled system, what numbers will mean a more efficient system? large or small, neg or Pos
large negative number
Primary lysosomes fuse with phagocytic vesicles to form ?
secondary lysosomes.
Intracellular fluid contains large amounts of which ions?
K, Mg, Phosphate ions
The process of Diffusion is caused by?
The kinetic motion of the molecules
