Exchange

Question 1

What do cells or organisms need to exchange with their environment

Answer 1

Materials
Heat

Question 2

Do more chemical reactions happen every second in organisms with a larger volume or smaller

Answer 2

Larger

Question 3

Where does gas exchange take place inside the lungs

Answer 3

Alveoli

Question 4

How have Alveoli adapted to increase diffusion rate

Question 5

Why do we need to breathe

Answer 5

Ventilation (breathing) ensures that air with a high conc. of oxygen is taken into the longs, and air with a high conc.not co2 is removed from the lungs.

This maintains high conc gradients between air (inside your alveoli) and blood, increasing the rate of diffusion of oxygen and co2

Question 6

If the volume of an enclosed space is inc. the pressure inside it wil…

Answer 6

Decrease

Question 7

Where are the lungs locate d

Answer 7

Suspended in the airtight thorax

Question 8

How does breathing work

Answer 8

Increasing the volume of the thorax decreases the air pressure on the lungs to bellow at,spherical pressure. Air flows into the lungs, inflating them until the pressure in the alveoli equals that of the atmosphere.

Decreasing the volume of the thorax increases the pressure in the lungs and air flows out until the pressure in the alveoli drops to atmospheric pressure

Question 9

Explain breathing in

Answer 9

Intercostal muscles and diaphragm contract

Thorax volume increases

This decreases the pressure so air flows in

Question 10

Explain breathing out

Answer 10

Intercostal muscles and diaphragm relax

Thorax volume decreases

This increases the pressure, so air flows out