1.4 Transportation of oxygen Flashcards
What is myoglobin?
present in muscle cells
stores oxygen and allows it to be used quickly for energy production
What us the oxygen dissociation curve?
used to explain how different partial pressure of oxygen in different areas of body have an effect on amount of oxygen combining with haemoglobin
What is partial pressure of oxygen at lungs?
high partial pressure in the lungs
low in blood stream
so lots of oxygen diffuse into bloodstream to attach to haemoglobin
What is partial pressure of oxygen at muscle tissue?
high partial pressure in blood stream
low in muscle tissues
so haemoglobin separate from oxygen which diffuses into muscle tissue
What is the Bohr shift?
Curve shift to right
During exercise, oxygen dissociates from haemoglobin more quickly in order to get more oxygen to working muscles - require more oxygen
partial pressure different causing oxygen to dissociate quicker
Why is there an increase in oxygen dissociation from haemoglobin?
increase in blood temperature
partial pressure of carbon dioxide increases
increase in carbon dioxide means there is decrease in pH level of blood - so blood is more acidic
What does a oxyhaemoglobin dissociation graph show?
relationship between oxygen and haemoglobin, based on partial pressure of oxygen
What does the Bohr shift show?
result of increase in blood acidity
suggests oxygen less willing to bind to haemoglobin in low pH levels and will dissociate more readily into muscle cells
What is the difference between haemoglobin and myoglobin?
haemoglobin - oxygen binding protein in red blood cells
myoglobin - oxygen binding protein in muscle cells
What is the role of myoglobin during exercise?
release oxygen at fast rate, allowing more energy to be produced
How is oxygen taken up by haemoglobin from lungs?
high partial pressure of oxygen in alveoli
high concentration gradient, resulting in diffusion and oxygen passing into blood to bind with haemoglobin
low partial pressure of oxygen in muscle tissue and high partial pressure of carbon dioxide
oxygen dissociates from haemoglobin and diffuses out and carbon dioxide diffuses in
