Homeostasis Flashcards
What is homeostasis?
Maintaining a constant internal environment
What is negative feedback?
A change to the normal level triggers a response which reverses effects of change
What is positive feedback?
A change to the normal level triggers a response which increases effects of change
What is a co-ordinator?
Brain stimulates pituary gland to secrete oxytocin
Body temperature is controlled by what in the brain?
The hypothalamus
How is the body effected by a fall in temperature?
Shivering, blood directs to body centre, increased metabolical rate and secretion of TSH
How is the body effected by an increase in temperature?
Sweating, Vasodilution, more heat released by radiation and sweating increasing
BGC (groups of genes involved in the production of metabolites) is decreased by what?
Insulin
BGC (groups of genes involved in the production of metabolites) is increased by what?
Glucagon
Body waters needs to be maintained to order what?
Maintain blood volume and blood pressure
Water balace is important because it allows what?
Blood to be transported around the body to ensure all tissues get oxygen
If blood volume is too high what is caused?
hypotension
How do we gain water?
Food + Drinks
How do we lose water?
Urine, sweat, breathing
What are the two functions of the kidneys?
Excretion of urea + Osmoregulation
What is Osmoregulation?
Controls of water and salt levels, and is an example of negative feedback
Why is glucose in urine a sign of diabetes?
Lack of insulin, High Blood Glucose + Not all of it is selectively reabsorbed
What are hypotension impacts on tissue fluid formation?
Reduces water potential, increases tissue volume, less water can be absorbed, fluids are forced out
How does negative feedback control the bodies water balance
More water is reabsorbed, ADH binds to receptors, causes vesticles to fuse with the cell membrane and reduce water reabsorption
