Respiratory system and ventilation in humans

Question 1

Why do you need to get oxygen into your bloodstream?

Answer 1

To supply your cells for respiration

Question 2

What do you need to get rid of in your body?

Answer 2

Carbon dioxide

Question 3

Where are the lungs?

Answer 3

In the thorax

Question 4

What is the thorax?

Answer 4

The top part of your body

Question 5

How is the thorax separated from the lower party of the body?

Answer 5

By the diaphragm

Question 6

What are the lungs protected by?

Answer 6

The ribcage - they are surrounded by pleural membranes

Question 7

When you breathe in where does the air go?

Answer 7

Through the trachea which splits into two tubes called bronchi, one going to each one (bronchus)

Question 8

What do bronchi split into?

Answer 8

Smaller tubes called bronchioles

Question 9

Where do the bronchioles end?

Answer 9

As small bags called alveoli where gas exchange takes place

Question 10

What happens when you breath in?

Answer 10

• Intercostal muscles and diaphragm contract (fattens out) - Thorax volume increases - This decreases the pressure, drawing in air

Question 11

What happens when you breath out?

Answer 11

• Intercostal muscles and diaphragm relax (moves up) - Thorax volume decreases - Air is forced out

Question 12

How can you investigate the effect exercise has on breathing rate?

Answer 12

• Sit still for five mintues
• For one mintue count the number of breaths you take
• Do four mintues of exercise
• As soon as you stop count your breaths per minute
• Get others to do the same and compare your resutls

Question 13

What should the results conclude?

Answer 13

Exercise increases breathing rate - this is because your muscels respire more during exercise as they need to be supplied with O2 and remove CO2 to it needs to increase

Question 14

What should be control varibles in the experiment?

Answer 14

• Time spent exercising (stopwatch)
• Temperature of the room (air conditioning or thermostat)