Homeostatis

Homeostatis is regualting a constant internal enviorment, by maintaining levels of:

• Water
• Temperature
• Blood sugar levels

Negative feedback

Applies to all forms of homeostatis

It is where our body reacts in an opposite way to something already going on.

For example, controlling our body temperature is negative

This is keeping our body temperature at a temp. of 37 degrees. If our temperature goes above or below 37, then our body reacts to try and get it back to 37.

1. Nerve endings in the dermis send a message to our hypothalamus (part of our brain which controls body temp.)

2. Hypothalamus sends an impulse to the dermis to get the temperature back to 37.

Hypothalamus

It is the part of our brain that controls body temperature. It does this by sending impulses to receptors and effectors, triggering a response.

Hormones:

ADH- Causes the kidneys/pituatiry glands to produce more concentrated urine.

Insulin- Produces by pancreas which cause the liver to change glucose into glycogen (maintain sugar levels if high)

Glucagon- Hormone produced by the pancreas which causes the liver to change glycogen into glucose (maintain sugar levels if low)

What is the hormone released to make concentrated urine called?

ADH

What gland produces ADH?

The pituatiry glands

What does insulin do?

 causes the liver to store excess glucose as glycogen

What is the name given to maintaing water levels?

Osmoregulation

What part of the brain monitors impulses and sends them?

Hypothalamus