1What can homeostasis be described as?
A dynamic steady state. Organism maintaining a dynamic steady state internally, in response to external changes.
2Why is homeostasis described as a dynamic steady state?
Things are constantly changing and exchanging in between compartments. (ICF and ECF).
Concentration flux
3List all homeostatically regulated factors:
Blood sugar (digestive system), water and salt content (Kidneys), blood pressure (Heart, Vessel, Kidney), waste product (Kidney), blood pH (Kidney, Lungs), CO2 and O2 (Lungs), body temperature (Muscles).
4Define homeostatic body system:
Interconnected network of body components.
5Define Intrinsic, give example...
The "local" environment of the cell
The cells neighborhood
Regulation of the organ's cells and tissue
The muscles' O2 levels during exercise
6Define Extrinsic, give example...
Body wide regulation to alter organ activity.
Systemic regulation
ALWAYS the endocrine and or nervous system
7Define the feedback loops:
Negative feedback loop - homeostatic variable.
Stabilizes the variable.
Negative response opposing the initial change.
Positive feedback loop - NOT homeostatic.
Reinforces the initial change.
Childbirth is an example: contractions.
Feed forward:
Responses made in anticipation of change (Pavlov's dog).
8Name the order to Feedback Loops
Stimulus -> Sensor -> Integrating center -> Effector -> Response