Breathing/Homeostasis

Question 1

Inhaling

Answer 1

• Brain sends signals to muscles in diaphragm to contract.
• Ribs are pulled up and out, diaphragm flattens downwards.
• Volume of chest increases, air pressure drops, air is drawn into lungs and alveoli.

Question 2

Exhaling

Answer 2

• Rib muscles and diaphragm relax.

- Air pressure in lungs increases, air is pulled out from the alveoli.

Question 3

Homeostasis

Answer 3

The maintenance of a constant internal environment within the body.

NOTE: Homeostasis works by negative feedback.

Question 4

Functions of water in living organisms

Answer 4

• Metabolism
• Medium for chemical reactions
• Transport system

Question 5

Importance of maintenance/homeostasis

Answer 5

If not maintained, enzymes will become denatured.

Question 6

Intercostal muscles

Answer 6

Move the rib cage up and down.

Question 7

Diaphragm

Answer 7

A sheet of muscle at the base of the rib cage.

Question 8

Endotherm

Answer 8

Warm-blooded

Question 9

Ectotherm

Answer 9

Cold-blooded