Homeostasis Flashcards
What is homeostasis?
It is the maintenance of a constant internal environment
What 6 things need to be controlled in the body?
Temperature, Water, Iron content, Blood sugar, Carbon dioxide and Urea
The body temp can’t get too [ ] or too [ ]
hot
cold
What could too mc water do?
Water could move into and out of cells and damage them.
What could happen with the wrong iron content?
Water could move into and out of cells and damage them.
Which 2 of the things that need to be controlled are WASTE products?
Carbon dioxide and Urea
What is Co2 a product of? Why doe sit need to be controlled?
Product of respiration. It’s toxic in high quantities so it’s got to be removed.
What is urea made from?
Excess amino acids
Why does temp need to be controlled?
All enzyme work best at a certain temp. If the body gets too hot or too cold the enzymes won’t work properly and some really important reactions could be disrupted. This could leave to death.
What temp to enzymes in the human body need to be at?
37°C
What acts as the body’s thermostat?
The thermoregulatory centre in the brain
What doe the thermoregulatory centre contain?
Receptors that are sensitive to the temperature of the blood flowing through the brain
What does the thermoregulatory centre receive impulses from? Why is this useful?
From the skin, giving info about skin temp
What happens to your hairs when you are too hot?
They lie flat
When you’re too hot [ ] is produced by [ ] glands and evaporates from your [ ], which removes heat
sweat
sweat
Skin
What do blood vessels to when you’re hot? Why?
Blood vessels supplying the skin dilate so more blood flows close to the surface of the skin. This makes it easier for heat to be transferred from the blood to the environment
What happens to your hairs when you are cold? Why?
They stand up to trap an insulating layer of air
What do blood vessels to when you’re cold? Why?
Blood vessels supplying the skin capillaries’ constrict to close off the skin’s blood supply.
What happens when you shiver? Why is this useful?
Your muscles contract automatically. This needs respiration, which releases some energy to warm the body.
