Gas exchange and breathing

Question 0

What is the 1st tube called that air goes down from the mouth?

Answer 0

The trachea (wind pipe)-a large tube

Question 1

Where does air enter?

Answer 1

Through your nose and mouth

Question 2

Which tubes link the bronchi to the air sacs in the lungs?

Answer 2

The bronchioles - tiny tubes in each lung.

Question 3

What does air move into from the bronchioles?

Answer 3

The alveoli - air sacs. One air sac is called an alveolus.

Question 4

What happens after the air has moved into an air sac?

Answer 4

Oxygen diffuses into the blood

Question 5

What is gas exchange?

Answer 5

Gas exchange is when O2 goes into the bloodstream and CO2 goes from the blood stream to the alveolus

Question 6

What is a capillary?

Answer 6

A tiny blood vessel

Question 7

What is respiration?

Answer 7

Making energy in cells in all living things all the time

Question 8

What tubes does the trachea lead to?

Answer 8

The trachea splits into two ‘bronchi’ (each one is a ‘bronchus’). Each bronchus leads to a lung.

Question 9

Where does gas exchange take place?

Answer 9

In the lungs.

Question 10

Which gases are exchanged in the lungs when air is breathed in?

Answer 10

Oxygen and Carbon Dioxide

Question 11

During gas exchange, where does each gas move from and to?

Answer 11

Oxygen moves from the air sacs (alveoli) to the blood vessels (capillaries).

Carbon dioxide moves from the blood vessels to the air sacs.

Question 12

What is the waste product of respiration?

Answer 12

Carbon dioxide - it passes out of the blood and into the air sacs (alveoli) from where it is breathed out.

Question 13

What is inhaling and exhaling?

Answer 13

Inhaling - breathing IN

Exhaling - breathing out

Question 14

How do we breathe air in and out?

Answer 14

1 Diaphragm moves down, increasing the volume of the chest cavity.
2 This makes pressure decrease, so air rushes in to fill the lungs.
3 Diaphragm moves up, decreasing the volume of the chest cavity.
4 This makes pressure increase, forcing air to rush out.

Question 15

What process occurs in the alveolus?

Answer 15

Gas exchange

Question 16

Which bones protect the lungs?

Answer 16

The ribs.

Question 17

Which air has most carbon dioxide? Inhaled air or exhaled air?

Answer 17

Exhaled air. Carbon dioxide is the waste product of respiration and is exchanged for oxygen in the lungs, so oxygen is inhaled and carbon dioxide is exhaled.

Question 18

What is the trachea?

Answer 18

The windpipe. It links the mouth to the bronchi.

Question 19

What happens when you inhale?

Answer 19

Your diaphragm moves down making more room in your chest cavity. This decreases pressure so air is drawn into the lungs.

Question 20

What happens when you exhales?

Answer 20

Your diaphragm moves up making less room in your chest cavity. This increases pressure so air is forced out of your lungs.

Question 21

How does oxygen get into our blood stream.?

Answer 21

We breathe in so oxygen enters the body through the nose and mouth. It travels down the trachea, along a bronchus, then along a bronchioles, into an alveolus. From the alveolus it diffuses into the blood.

Question 22

Whats the difference between exhaled air and inhaled air?

Answer 22

Inhaled Exhaled

Cooler Warmer
Contains more oxygen Contains less oxygen
Less carbon dioxide More carbon dioxide
Less water vapour More water vapour
Muscles contract. Muscles relax
Ribcage moves up and out. Ribcage moves down and inwards
ACTIVE. Passive

Question 23

How do the ribs and diaphragm move when you breath in and out?

Answer 23

Breath in Breath out

Ribcage moves up and out. Ribcage moves down and in
Diaphragm moves down. Diaphragm moves up

Question 24

Explain why the ribs and diaphragm force air in and out?

Answer 24

Because some cells can’t function without oxygen so the ribs and diaphragm force In the air but it forces the air out because it’s a waste product and the and the body doesn’t need it.

Question 25

Describe the pathway of air as it moves into the lungs

Answer 25

You breath in through your nose, then it goes down the trachea into the bronchus through the bronchioles the into the alveolus.

Question 26

Describe 4 features of the alveolus that make it good at its job

Answer 26

Close blood supply
They give the lungs a really big surface area
They have moist thin walls just 1 cell thick
They have a lot of tiny blood vessels called capillarys