F.5 Ch.19 Homeostasis

Homeostasis is to maintenance of a stable internal environment.

• True

• False

homeostasis is triggered by the external environment only

• True

• False

The group of organisms that use the process of homeostasis includes

• mammals, only

• animals, only

• plants and animals

• all living things

chemical made by glands that tell cells to make something or respond in some way.

• acid
• enzyme
• perspiration
• hormone

Why we have to keep the body temperature stale?

• We feel hot/cold

• enzymatic activity is affected

• we don't have to

• it affects global warming

Why we have to keep the water potential in our body stable?

• To remove the urea

• we feel thirsty easily

• we don't have to

• osmosis - cells will burst / shrink

How to regulate homeostasis?

• osmosis

• active transport

• negative feedback mechanism

• positive feedback mechanism

Negative feedback mechanism is a change in the internal environment leads to a response that reverses the change

• True

• False

Negative feedback mechanism is regulated by endocrine system only

• True

• False