Animal Coordination, Control and Homeostasis Flashcards
What’s homeostasis ?
Maintenance of a stable internal environment despite changes from internal and external conditions
6 things that need to be controlled in the human body….
Waste products …
-Removal of c02
-Removal of urea
Good and need to be kept at right level…
-Water content
-sugar content
-temperature
-ion content
What happens if you have too much carbon dioxide in your?
Blood ph becomes acidic, cells denature
What happens if you have too much urea in you?
Too much alkali
3 ways the body gains heart..
-general metabolism
-radiation and conduction from the environment
-muscle contractions
3 ways the body looses heat…
-expiration and excretion
-evaporation of sweat
-radiation, conduction and convection from the environment
How does the skin protect us when we’re too cold?
-fat in the skin works as insulation
-nerve endings in the skin detect temperature
-hair works as insulator and traps air in it
-vasconstriction . Blood vessels get thinner to reduce blood flow near the surface
2 ways the skin protects us when we’re too hot…
-sweating , evaporation of sweat on the skin surface takes heat away from blood and cools it
-vasolidarion, blood vessels get wider increasing blood flow to skin surface
What’s negative feedback?
Human Example of negative feedback
-when a change happens and something happens to undo that
-you’ve eaten too much and feel sick so you stop eating
What’s positive feedback?
Positive feedback makes change worse, exxagwrates it
What’s the hypothalamus?
Part of your brain that monitors everything such as temp
What’s the pituitary?
What’s it also involved in?
-A gland that produces hormones.
-involved in homeostasis
What’s the body does when our body temp goes up and we want to bring it down?
-increase in blood temp / impulses from skin, warm receptors up
-detected by thermometers in the heat loss centre of the hypothalamus
-impulses vio motor neurons leads to response such as sweating
What happens when our body temp goes DOWN and we want to bring it up?
-decrease in blood temp / impulses from skin cold the receptors
-impulses via motor neurons give us the responses such as shivering
What does endocrine mean?
Endocrine = within a blood stream
