Section 1-3 Homeostasis

What is homesostasis? What does the physiological system do? What is homeostatic regulation? Why is maintaining homeostasis is essential? What happens when homeostasis isn’t maintain?

-What is homeostasis?

• The maintenance of a stable internal environment in the body

-What does the physiological system do?

• Works to maintain homeostasis despite change in the external (outside) environment.

-What is homeostatic regulation?

• prevents disruptive changes in the body’s internal environment

-Why is maintaining homeostasis is essential?

• Essential for survival

What happens when homeostasis isn’t maintain?

• Lead to Illness or death

What are the two mechanisms to regulate homeostasis? Define them also

Two mechanisms to regulate homeostasis:

• Autoregulation (Intrinsic Regulation):

When an organ, cell, or tissue automatically regulates its activity in response to a change in its environment.

• Extrinsic regulation:

When an organ system is regulated by the nervous system or endocrine system in respsonse to an external (outside) change.

Homeostatic regulation involves what (listed 3) and define them

Homeostatic regulation involves:

• A receptor: (sensor) Detects a change (stimulus) in the internal (inside) and external (outside) environment.

• A Control center (decision maker): Receives information from the receptor and determines what response is needed.

• An Effector (Responder) : Carries out the response that helps correct the change.

What are the types of homeostatic regulation? and define them

• Negative Feedback: Maintains homeostasis by opposing or reducing the (change) effects of a stimulus.

• Positive Feedback: Maintains homeostasis by exaggerating or amplifying the (change) effects of stimulus.