Lungs And Gas Exchange

Question 1

In order to get energy what do our cells need

Answer 1

Cellular respiration which oxygen is needed for it

Question 2

Order of breathing

Answer 2

When we breathe in air first passes through our mouth or nose then down the trachea (wind pipe)

Then divide between our to bronchi then further divide between ‘branch like’ structures called bronchioles

Then it reaches our sacs called alveoli (the site of gas exchange)

Question 3

What is a single alveoli called?

Answer 3

Allveolus

Question 4

How is the alveoli adapted ?

Answer 4

•The alveoli is made up of very small cells which allows diffusion between carbon dioxide and oxygen to be increased

•They also have a large surface area instead of having one alveoli adults have hundreds of millions of alveoli which can cover (half a tennis court)

The alveoli walls are moist which allows the gases to dissolve which increases the rate of diffusion

Question 5

What happened to the blood in the capillaries

Answer 5

Gives a lot of oxygen to the tissues which means it won’t have enough left so it will be shown as blue then the alveoli diffuses oxygen into the rbc blood cells making it oxygenated

When there is carbon dioxide (dissolved by blood plasma) it is breathed out

Question 6

Equation for breathing rate

Answer 6

Number of breathes/Number of minutes taken=Breathing rate

Question 7

Which substance inside the red blood cell does oxygen bind to

Answer 7

Haemoglobin