topic: regulation aim: explain the importance of negative feedback. do now: next slide hw: finish...
TRANSCRIPT
TOPIC: RegulationAim: Explain the importance of
negative feedback.
Do Now: Next slide
HW: Finish skeletal system reading notes
Nervous and Endocrine System Castle Learning due Thursday!
A B
C
D
E
terminal branchesF
Identify all glands labeled in the diagram.
Pituitary gland
Thyroid glandParathyroid gland
Pancreas
Ovaries
Adrenal glands
To communicate between cells, humans and animals use:
1.nerve signals and respiratory gases
2.respiratory gases and hormones
3.bones and muscles
4.nerve signals and hormones
Negative Feedback
Temperature goes above set value
Thermostat turns heat off
Temperature falls below set temperature
Thermostat turns on heat
Thermostat
•Maintains homeostasis•Controls the release of
hormones throughout the body
1. Maintaining blood glucose levels with insulininsulin and glucagonglucagon
Examples
1. What occurs after you eat a meal?
2. What effect does eating a meal have on your glucose levels?
3. How does the pancreas respond?
4. Describe the effect insulin has on the body.
and more glucagon
2. Amount of thyroxine in the blood
Thyroxine LevelThyroxine level too
low
Pituitary gland secretes TSH
TSH stimulates thyroid to produce thyroxin
Thyroxine level increases
Thyroxine level too high
Pituitary gland stops TSH production
Thyroid decreases thyroxine production
Thyroxine level decreases
3. Maintaining body temperature (thermoregulation)
Let’s summarize…
1. Describe the importance of negative feedback.
2. Describe how negative feedback maintains your blood sugar level.
3. Identify some other examples of negative feedback.
C
ABMedulla oblongata
Cerebellum
Cerebrum
Involuntary activities
Memory, thinking and reasoning
Balance and coordination