Homeostasis Flashcards
Homeostasis definition
Maintaining a relatively stable internal environment, even when faced with external changes
What is the internal environment?
Composition of interstitial fluid (fluid outside of the cells)
What are the 6 controlled conditions?
Temp, Water balance, electrolyte balance, blood pH, blood glucose, blood pressure
The two body systems that control homeostasis are
Endocrine and nervous systems
What are receptors in regards to the continuous feedback loop?
Receptors respond to a stimulus that causes a change in the controlled condition
Role of effectors
Means in which the control centre regulates the controlled condition. They can be muscles or glands
What are negative feedback mechanisms?
Where the control centre is wanting to reverse the change in the controlled condition
What is a baroceptor?
Sensors located in the aortic arch and carotid sinus. Sense blood pressure
What are glucoreceptors?
Receptors that are sensitive to the change in blood glucose levels
What are osmoreceptors?
Receptors that detect a change in osmotic pressure (amount of fluid present in the body). Found in the hypothalamus of the brain.
What are thermoreceptors?
Receptors found in the skin, sensitive to change in body temperature
The body system that receptors are associated with
Nervous system
Where is the control centre?
Hypothalamus
What are positive feedback mechanisms?
Where the change in controlled condition is increased/intensified until the end result is reached and the feedback loop is terminated
What are chemoreceptors?
Receptors that sense a change in pH
