How much we breathe

Objectives  Understand tidal volume, respiratory rate, vital

capacity  Understand the effects of exercise and training on breathing, capacity and volume

Starter  Count how many breathes you take in 1 minute

Respiratory Rate  The number of breaths you take in one minute

=

Tidal Volume  The volume of air you breathe in (or out) with each

breathe

=

Minute Volume  The volume of air you breathe in per minute  Minute Volume= tidal volume x respiratory rate

=

What happens when you exercise?  All 3 increase  Typical 18 Year old

Tidal Volume (Litres)

0.5

2.5

Respiratory Rate (Breaths/min)

12

30

Minute Volume (Litres/min)

6

75

Vital Capacity  The maximum amount of air you can breathe out after

breathing in as deeply as you can =

Residual Volume  The amount of air left in your lungs after you breathe

out as hard as you can.  Usually around 1.5 litres – you can never empty your lungs completely

Lung volumes Diagram handout

Effects of training  Breathing muscles grow stronger which allows deeper

breathes – vital capacity increases  More alveoli become surrounded with capillaries so gas exchange is more efficient  Aerobic / stamina work can continue longer

Lungs and exercise 1. During exercise cell respiration in your muscles increases, so the level of CO2 rises

2. Your brain detects this, it sends a signal to your lungs to breathe faster and deeper

3. Gas exchange in your lungs speeds up. More CO2 passes out of the blood and more O2 passes in 4. The brain also sends a signal to your heart to beat faster so – More blood gets pumped to the lungs for gaseous exchange More blood gets pumped to the muscles, carrying O2 and removing CO2

The Respiratory System 2 [Compatibility Mode]

Starter. Count how many breathes you take in 1 minute ... During exercise cell respiration in your muscles increases ... More blood gets pumped to the lungs for ...

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