gas exchange

Question 1

describe a method you could use to find the surface area of a leaf

Answer 1

1. Draw around the leaf on graph paper.

2. Count squares and multiply by 2 (for upper leaf and lower leaf surface)

Question 2

Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs.

Answer 2

1. Trachea,bronchi and bronchioles
2. Down pressure and diffusion gradient
3. Across alveoli epithelium and capillary endothelium