Transportation of oxygen Flashcards
What is the first stage of the transport of oxygen from the lungs to the muscles?
Partial pressure of oxygen in lungs is high
Oxygen moves from an area of high pressure to low pressure (diffusion)
What is the second stage of the transport of oxygen from the lungs to the muscles?
Haemoglobin becomes saturated with oxygen, forms oxyhaemoglobin.
What is the third stage of the transport of oxygen from the lungs to the muscles?
Oxygen disassociates itself from haemoglobin due to lower partial pressure in myoglobin (diffusion)
What is the final stage of the transport of oxygen from the lungs to the muscles?
The oxygen is stored in myoglobin - awaiting aerobic respirtation.
What is haemoglobin?
Oxygen carrier in red blood cells, transports oxygen to working muscles.
What is myoglobin?
Oxygen carrier in the muscles, and has a higher affinity to oxygen than haemoglobin.
It is found in slow twitch muscle fibres
What is the oxyhaemoglobin
disassociation curve?
It shows an S-shaped line which moves to the right during exercise, which is known as the Bohr shift.
What is the Bohr shift?
When the S-shaped line moves to the right.
Give 4 reasons why the Bohr shift occurs
- Increased blood temperature
- Increases blood acidity
- Increased partial pressure of CO2
- Increased disassociation of oxygen
What is the Bohr shift process?
- Start exercising
- Increased blood temperature
- Increases blood acidity
- Increased partial pressure of CO2
- Increased disassociation of oxygen
- Myoglobin receives more oxygen
In what three ways is carbon dioxide transported in the blood?
- Carbonic acid
- Dissolved in plasma
- Combines with haemoglobin-carbaminohaemoglobin
What are the long term effects of exercise on the transportation of O2?
- More blood volume (more RBC’s etc)
- Increased a-VO2 diff
- Increased capillarisation
