Unit 3- Movement Of Molecules In And Out Of Cells

Question 1

What is active transport?

Answer 1

Movement of particles from an area of low concentration to high

Question 2

Name 3 ways in which an exchange surface can be adapted to enhance gas exchange?

Answer 2

1) large surface area
2) good blood supply
3) thin

Question 3

Where is an exchange surface on a plant? What does it have to let water in and out?

Answer 3

The underside of a leaf. Stomata

Question 4

What is the thorax? What is the abdomen?

Answer 4

Thorax: above the diaphragm
Abdomen: below the diaphragm

Question 5

Describe each part of your breathing system?

Answer 5

The air goes through your TRACHIA, this splits into two BRONCHI which go into each lung, these split into BRONCHIOLES which end with small sacks called ALVEOLI (exchange surface)

Question 6

What happens when you inhale?

Answer 6

Your costal muscles and diaphragm contract, the thorax volume increases creating less pressure, this is ventilation.

Question 7

What happens in an artificial ventilator like the iron lung?

Answer 7

The pressure drops so lungs automatically expand and then the opposite happens.

Question 8

What does digested food diffuse through from the gut to the blood?

Answer 8

Villi

Question 9

Name 3 ways the villi are adapted for food diffusion?

Answer 9

Large surface area, good blood supply, only 1 layer of surface cells.

Question 10

What is osmosis?

Answer 10

The movement of water molecules across a partially permeable membrane, from a region of high water concentration to low.