Effect Of Different Exercise Intensities And Recovery On Gaseous Exchange Flashcards Preview

A-Level PE Anatomy And Physiology > Effect Of Different Exercise Intensities And Recovery On Gaseous Exchange > Flashcards

Flashcards in Effect Of Different Exercise Intensities And Recovery On Gaseous Exchange Deck (18)
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1

What happens as the levels of O2 increase and CO2 levels decrease towards their pre-exercise values

The concentration gradient becomes less steep which causes gaseous exchange to slow down again

2

What does deoxygenated blood returning to the lungs have (2 things)

1. A lower PP of O2 than at rest
2. A higher PP of CO2 than at rest

3

What is there between the alveoli and the blood

A steeper concentration gradient than at rest

4

What does the steeper concentration gradient at the lungs cause during exercise

A faster ad more efficient gaseous exchange

5

What happens at the lungs during inspiration and expiration at the lungs (2 things)

1. More O2 moves from alveoli and associates with the haemoglobin in the blood
2. More CO2 diffuses from blood to alveoli to be expired

6

Define association

Association is where O2 combines with haemoglobin at the lungs to form oxohaemoglobin

7

Define saturation

Saturation is the percentage of O2 combined with haemoglobin and depends on the PP02

8

Define dissociation

Dissociation is the O2 is released from haemoglobin to diffuse into the muscles

9

Define what the oxohaemoglobin dissociation curve is

The oxohaemoglobin dissociation curve shows the relationship between PPO2 and the percentage of saturated haemoglobin

10

How saturated in haemoglobin with O2 at the lungs

100%

11

At rest, how much O2 dissociates from the haemoglobin and diffuses into the muscles

25%

12

What are the four reasons why the oxohaemoglobin dissociation curve shifts right during exercise

1. Oxygen
2. Carbon dioxide
3. Body temperature
4. Acidity

13

How does oxygen effect the curve (3 parts)

1. Muscles use more O2 during exerciser so decreased PPO2 inside muscles
2. Steeper concentration gradient between blood and muscles
3. Causes more O2 to dissociate from haemoglobin

14

How does carbon dioxide effect the curve during exercise
(3 parts)

1. Muscles produce more CO2 during exerciser so increased PPCO2 inside muscles
2. Steeper concentration gradient between the muscles and the blood
3. Causes more CO2 to diffuse into the blood from the muscles

15

How does body temperature effect the curve

An increase in body temperature causes O2 to dissociate from the haemoglobin more easily

16

How does acidity effect the curve

1. Carbonic acid and lactic acid increase acidity which causes O2 to dissociate from the muscles more easily

17

What is it called when an increase in acidity shifts the curve to the right

The Bohr shift

18

During exercise, how much O2 dissociates from the blood to the muscles

60%

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