Homeostasis Flashcards
What is the key concept of physiology?
Homeostasis
What does homeostasis refers to?
Maintaining relative constancy in a system.
Is homeostasis is a dynamic or static process?
Dynamic
What is negative feedback?
It keep the body relatively stable in a challenging or changing environment
What is an example of dynamic constancy?
Blood glucose levels increase after eating.
Levels return to their set point via homeostasis.
What do levels do over a short amount of time?
They change
What do levels do over a long amount of time ?
They remain relatively constant over long periods of time.
Is positive feedback homeostatic?
No
What does positive feedback do?
Increases initial stimulus instead of decreasing or removing it.
Vascular spasm
Smooth muscle contracts vasoconstriction.
Platelet plug formation
- Injury to lining of vessel exposes collagen fibers; platelets adhere.
- Platelets release chemicals that make nearby platelets sticky; platelet plug forms.
Coagulation
Fibrin forms a mesh that traps RBC & platelets, forming the clot.
