Homeostasis And The Kidney Flashcards
What is negative feedback?
A change in a system produces a second change, which reverses the first change.
Examples of negative feedback
- glucose concentration in the plasma
- body’s core temperature
What is positive feedback?
An effector increases a change
Example of positive feedback
- oxytocin stimulating contractions
- platelets adhering to a cut
What is homeostasis?
Maintenance of a constant environment
How is water removed from the body?
- excreted-Waste product of respiration
- secreted- tears or saliva
- egested in faeces
What are the 2 main functions of the kidneys?
- excretion
- osmoregulation
What is excretion?
The removal of metabolic waste made by the body.
What is osmoregulation?
The control of the water potential of the body’s fluids by the regulation of the water content of the body
Where does ultrafiltration take place?
The bowmans capsule
What is is the glomerular filtrate?
- water
- glucose
- salts
- urea
- amino acids
Where does selective reabsorption take place?
Proximal convoluted tube
