IGCSE Coordinated Science Topic 97 A nimal Systems Learning Objectives Understand why exercise changed breathing and pulse rate Learn about the difference between aerobic and anaerobic respiration ID: 659185
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Slide1
Exercise & Respiration
IGCSE Coordinated Science
Topic 9.7
A
nimal SystemsSlide2
Learning ObjectivesUnderstand why exercise changed breathing and pulse rate.Learn about the difference between aerobic and anaerobic respiration.
Learn about oxygen debt. (Higher only)Slide3
Success CriteriaI can find and measure my own pulse rate.I can explain the link between increased exercise and increased pulse/breathing rate.I can explain the link between anaerobic respiration and build up of lactic acid.Slide4
StarterLook at the pictures below and use them to help you detect your own pulse.
Measure your pulse rate
by counting the number of beats in
one minute
.
Why might your pulse rate not be at the normal rate right now?Slide5
StarterThink about an average weekday and all of the things you might do during the course of the day. List what activities can raise or lower your pulse rate…Slide6
Exercising and Feeling TiredLet’s look back at the equation for aerobic respiration…glucose + oxygen
carbon dioxide + water
When we exercise, our cells work harder and require
more energy to be released
. (respiration)
Therefore, the cells need more
glucose
and
oxygen
.Because of this, our
breathing rate
and
pulse rate
increase to satisfy the demand.
When we exercise, we need
more
of these two.
This means more of this is produced.
It
must be removed.Slide7
1. Cells need more
glucose + oxygen
for respiration
2. Breathing rate
+
Pulse rate
increase in order to deliver glucose + oxygen to cells
3. High rate of respiration means lots of waste
carbon dioxide
is produced
4. The high breathing and pulse rate means that the carbon dioxide can be removed as
quickly
as possible.
Write out these steps under the heading
‘Exercise & Respiration’
.Slide8
Recovery RateBefore a game of football, if you were to measure your pulse rate, the reading would be called the “resting rate”.After a game of football, the
time taken for the pulse rate to return to the resting rate, is called the recovery rate
.
pulse rate
time
A
B
C
D
What do you think each time period represents? Fill in your own blank graph.Slide9
pulse rate
time
A
B
C
D
A:
Resting rate.
The normal number of beats per minute when not doing exercise.
B
:
The number of beats during exercise.
Lots of glucose/oxygen required by cells, so heart pumps blood faster.
C:
The recovery rate.
This is the time taken for the pulse rate to return back to normal.
D
:
This is the resting rate again.
The pulse rate has returned back to normal.Slide10
Anaerobic RespirationAnaerobic respiration is a type of respiration that can release energy without needing any oxygen
.It occurs during
hard exercise
, when
not enough
oxygen
can supplied for
aer
obic respiration to occur.glucose lactic acid
(that’s it!)
The equation is very different to aerobic respiration and produces
much less energy
per glucose molecule.
The lactic acid is
poisonous and builds up in muscles after hard exercise.Slide11
Lactic Acid & Muscle FatigueAfter intense exercise, lactic acid build-up causes muscles to stop working.
This is called muscle fatigue
.
It is also known as
cramp
and can be very painful.
You need to
rest
in order for the lactic acid to be broken down.
Remember, lactic acid is only produced during hard exercise.Slide12
Practical: Fist Clenching!Place your hand (palm-side up) on the desk.One person in the group needs to have the stopwatch. Ask them to count down ‘3, 2, 1, go!’ and then start the stopwatch to time 1 minute.
When they say ‘go!’, start clenching your fist as fast as you can while your partner counts how many times you can open and close your hand in 1 minute. Do not stop! Keep going for the whole minute.Record how many times you managed to make a fist in the table on worksheet b3_c_02.Now repeat the experiment so that everyone in the group does the fist clenching.
Repeat the experiment again, but this time the action should be raising your hand above your head and making fists.
Record your results in the table worksheet b3_c_02.
If you have time each group member should do the exercises again to see if they can improve on their previous scores.Slide13
TaskWhat type of respiration is used to release energy while you are asleep?What type of respiration is used to release energy when you are sprinting?
What chemical is produced during anaerobic respiration?
Why do your muscles hurt after a hard game of football?
Explain the difference between aerobic and anaerobic respiration.Slide14
higherSlide15
Oxygen DebtThe lactic acid that has built up during anaerobic respiration needs to be broken down.
Oxygen is required in the breakdown of lactic acid.
Heavy breathing
after exercise provides the extra oxygen required to break down lactic acid, and is known as the
oxygen debt.
This is followed by
panting
to allow aerobic respiration to resume.
It gets broken down in the
liver
.
The blood carries the lactic acid there.Slide16
plenarySlide17
In your books, describe what will happen to your breathing rate and pulse rate as you move towards your next destination in the college.Explain the changes.