Breathing

What we are learning about

• The structure of the lungs (L4)• How the lungs work ( L5)• Breathing problems (L6)

Why we are learning this

• Many people have breathing problems

• If you go without oxygen for 4 minutes your brain will die

starter

• In your groups of three

In your groups….

Think of a reason why

• AN OLD MAN WAS GASPING FOR BREATH. • • A BOY’S HEART WAS BEATING VERY FAST. •

Think of a reason why• an old man was gasping for breath.

• (Possible answers: he has been exercising; his lungs are not working properly; he has emphysema; there is not much oxygen in the air for him to breathe.)

• • • • • a boy’s heart was beating very fast. What could have caused this?

• (Possible answers: he has been exercising; he is nervous/ anxious/worried; his body is starved of oxygen; he is using a medication such as a salbutamol inhaler; he has been taking some illegal drugs or drunk very strong coffee.)

•

Previous work

• Inhaled and exhaled air

• RESPIRATION

Previous work

• Inhaled and exhaled air• - more carbon dioxide and water exhaled

• RESPIRATION• - produces ENERGY, carbon dioxide and water• - uses oxygen and glucose

Gases tableGas Inhaled

airExhaled

airReason for difference.

……..% 16% O2 absorbed into blood, used in

r………………………..

0.0……% 4%(100 times

more)

CO2 is a w…………… product of respiration

78% …….% Not used in cells

……..% 1% Not used in cells

Variable Always higher

Water is produced during r……………………….. and exhaled.

Some Possible answers if your group are stuck

• Water vapour• Nitrogen• Rare gases• 20• 0.04• 1 • Waste

Gases tableGas Inhaled

airExhaled

airReason for difference.

oxygen 20% 16% O2 absorbed into blood, used in

respirationCarbon dioxide

0.04% 4%(100 times

more)

CO2 is a waste product of respiration

nitrogen 78% 78% Not used in cellsRare gases

1% 1% Not used in cells

Water vapour

Variable Always higher

Water is produced during respiration and

exhaled.

LUNG STRUCTURE

TRACHEA

BRONCHUS

ALVEOLI

RIB

DIAPHRAGM

Breathing

Ventilation

When your muscles change the size of your lungs.

The movement of air into and out of your lungs

Inhaling and exhaling• Inhaling• The ribs move UP and the diaphragm moves

DOWN.• Exhaling• The diaphragm moves up and the ribs move

down

Lung volume

• Tidal volume – how much usually breathe in and out

• - how do you think this changes when you exercise?

• Vital capacity –amount of air can force out of lungs

Where does gas exchange occur?

The alveoli make gas exchange in lungs happen easily and efficiently.

They have moist, thin walls

They give the lungs a really big surface area

They have a lot of tiny blood vessels called capillaries.

The gases move by DIFFUSION.

Diffusion is where gases move from high concentration to low concentration:

Oxygen diffuses from air in the alveoli into the blood.

Carbon dioxide diffuses from the blood into the air in the alveoli.

How do the gases move?

Capillary

BREATHING AND RESPIRATION ACTIVITY

• Groups 1-4 complete sheet 2• Groups 5-8 complete sheet 1

Loop cards

• In your groups of three• The cards have a word and a meaning for

another word• Find that word• Put them in a loop

HOMEWORK• The kiss of life sheet• Answer all questions• And do q 6&7 page 31• By Friday 1st July

WRITE THIS IN YOUR PLANNER

answers

Quick check

• Complete this in your groups of three

Gas exchange ‘relay’

• Your team has some info about gas exchange and 3 answers to write

• When complete come to the front to check answers

• You will then get the next set of questions• Which team will win?