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