Chapter 29: Homeostasis Flashcards
What is homeostasis?
The ability of an organism to maintain a constant internal environment
Give3 examples of homeostasis.
Maintains body temp
Maintains Ph of tissue fluid and blood
Maintains sufficient levels of oxygen
What allows to maintain homeostasis?
Diffusion and exchange of materials
Why do single celled organisms not need special organs?
They are small enough to use only diffusion and osmosis for the exchange of materials
What are 4 specialized methods animals have for diffusion and exchange?
Flattened organ - leaf
Increased surface area - alveoli
Materials take to body surface
Circulatory system transports material
Why do animals need a circulatory system?
It is able to transport materials over long distances
Why is homeostasis important?
Allows organisms to function properly (body temp 37°)
Allows organisms to function regardless of external environment (can go through winter without hibernating)
Allows slight changes in internal environment (body temp falls by 1° when sleeping)
Why is temperature regulation important?
To keep enzymes working efficiently
What is an ectotherm?
Gain or lose heat from their external environment
What is an endotherm?
Generate their own heat from metabolic reactions
