Lungs

Question 1

Where are lungs located?

Answer 1

In the thorax and it is separated from the lower part of the body by the diaphragm

Question 2

What protects the lungs?

Answer 2

Ribcage and surrounded by pleural membranes

Question 3

Explain the splitting of the trachea.

Answer 3

• It goes in through the trachea (windpipe)
• the trachea is then split into two tubes called bronchi (bronchus singular) one going in each lung
• bronchi is then split progressively into small tubes called bronchioles
• bronchioles then end in small bags called alveoli where gas exchange takes place

Question 4

What is alveoli surrounded by?

Answer 4

network of blood capillaries

Question 5

What does blood passing next to the alveoli contain and why?

Answer 5

contains loads of carbon dioxide because it is has returned to the lungs from the rest of the body

Question 6

How does the alveoli carry out gas exchange?

Answer 6

the alveolus has a high concentration and the blood has a low concentration so oxygen diffuses out of the alveolus into the blood

the blood then has a higher concentration than the alveolus so the carbon dioxide is diffused out into the alveolus to be breathed out.

Question 7

What happens when blood reaches body cells?

Answer 7

oxygen is released from red blood cell (high concentration) and diffuses into the body cells (low concentration)

Question 8

Calculating Breathing Rate

Answer 8

Breaths Per Min (BPM) =

number of breaths/number of minutes