• Identify the chemical signal that is released by glands in the endocrine system

• Identify the structure that chemical messages bind to in order to initiate change in the body

• The disease diabetes is caused by a lack of a certain hormone in the body. Which hormone?

What is Diabetes?

• Read along

• Underline key points

• Answer the questions below

Examine This Diagram:Can you put the events in order?

What is happening here?

Disrupting Homeostasis…

How do we get back to normal after a change

disrupts our homeostasis?

HOMEOSTASIS

CHANGE

RESPONSE

CANCEL CHANGE

Negative Feedback- Thermostat

Decrease in temperature

Increase in temperature

Heater turns on

Heater turns off

HOMEOSTASIS

CHANGE

RESPONSE

CANCEL CHANGE

Negative Feedback- Insulin

What is negative feedback?

Provide an explanation in your own words on your notes

Summarizing What We’ve Learned

Negative Feedback- response that reverses changes in the body to restore homeostasis.

Summarizing What We’ve Learned

White Board Review

Quick Check!

After a question is presented, we will discuss in partners and write our answers on our “white boards”

We will hold these up to show Ms. L if we are Endocrine Experts or Failing Feedback

1. The ability of the human body to keep blood glucose within a fairly narrow range, despite constant changes in the environment, is an example of

a) the human niche b) genetic evolution c) homeostasis d) thermocrine regulation

2. Identify the structure in the human body that is the usual source of insulin.

a) the pituitaryb) the thalamusc) the hypothalamusd) the pancreas

3. Insulin:

a) Causes an increase in blood sugar

b) Is released in response to a decrease in blood sugar

c) Causes cells to use glucose

d) Initiates the production of glucose

4) A person with diabetes:a) does not make the hormone insulinb) does not make the hormone glucagonc) does not respond to insulind) either a or ce) both a and b

5.Which of the following is NOT an example of negative feedback.

a)the body experiences a decrease in temperature, this initiates shivering which raises the internal body temperature

b) Hormone A is released in response to an increase in blood pressure. This triggers the release of hormone B which increases the production of Hormone A

c) Insulin is released in response to an increase in blood sugar. It decreases the amount of sugar in the blood and then is no longer released

d)Hormone 2 is secreted in response to dehydration. This triggers the body to increase its water intake, which also stops the secretion of hormone 2.

HOMEWORK• Remaining Classwork problems

• HW 2.6- Negative Feedback and Diabetes

• REMINDER: Presentation Dates– Muscular/Skeletal: WEDNESDAY 10/5– Circulatory/Respiratory: THURSDAY 10/6– Excretory/Digestive: TUESDAY 10/11