Homeostasis notes

Homeostasis

The body’s attempt to stay within a normal and healthy range

Small Fluctions

are okay because changes happen an to ever changing environment

Homeostasis is when

The body is pretty good at remaining fairly stable

Normal level is called…

set point range

Normal temperature in the body

Temperature at 99 degrees

Normal adult blood sugar level

Blood sugar levels between 70 and 140 mg/dL ( fairly wide range of normal at different times of the body depending on when you have eaten )

Normal adult examples in WHITE BLOOD CELLS LEVELS

4,000 to 11,000 cells microliter

WHAT DO OUR BODIES DO WHEN WE ARE OUT OF THE SET POINT RANGE

Positive and negative loops

Feedback loops

A cycle in the body in which it attempts to regulate its set range

Positive feedback loops 1

Increases or amplifies what is already occurring in the body

Positive feedback example 1

Chemical that is released when a mother is giving birth it increases

Positive feedback loop example 2

A bacterial infection causing a continual increase in body temperature

Negative feedback loops

Decreases or inhibits what is already occurring in the body

Negative feedback loops ex 1

sweating causes your body to cool off

Shivering that cause friction to increase body temperature

What happens when blood sugar levels are high (HYPER GLYCEMIC)

Insulin is released by the pancreas when blood sugar is too high

what occurs when blood sugar is high

Insulin causes the cells to take in sugar From the blood stream and store it for later

what happens when blood sugar levels are low

Glucagon is released by the liver and instructs that stored sugar to be released back into the blood stream

what occurs when blood sugar is low in the body?

You often feel dizzy before this happens and the release of sugar brings you back to normal