2. What does it mean? Homeo = same Refers to stable state of your internal body – ex- body temperature, blood sugar level *Human Physiology is all about how your body maintains homeostasis and what happens when homeostasis is disrupted.

3. Mainly Regulated by Feedback Nerve receptors in your body that control turning on/off different body functions Usually in form of negative feedback – because the fixing of the sensed problem causes a the problem to lessen in your body

4. Examples of Homeostasis and problems associated… Body temperature/fever/hypothermia Blood pressure Blood sugar/diabetes Breathing rates Water levels/having to pee

5. Body Temperature Your body’s functions are all regulated by special proteins called enzymes. – cannot perform unless at the right temperature So, too hot  sweat too cold  shivering, “goose bumps” All are an effort to maintain 98.6 degrees *Fever- your body’s attempt to kill a pathogen inside you by changing your internal temperature. – also allows for faster white blood cell division

6. Blood pressure the pressure blood puts on the walls of the arteries leaving the heart – sensed by receptors high blood pressure is when too much volume flows through arteries can be caused by salt-heavy diet. Why? fixed by heart beating slower and/or with less force.

7. Blood Sugar Regulated by the pancreas insulin turns sugar into glycogen (storage) glucagon turns glycogen into sugar problem- diabetes – when body doesn’t make or doesn’t recognize insulin

8. Breathing Rate Regulated by pH receptor in brain – Carbon dioxide makes carbonic acid  acidity in blood as more carbon dioxide in blood, respiration rate increases

9. Kidney Function Drinking water  having to pee Kidneys responsible for regulating blood’s water content more water  bp problems, so water levels in blood are important- excess water is removed by urination to keep blood at proper volume

10. Question??? Give an example of a body function and describe its relation to homeostasis.