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Thank you so much for explaining everything really well. One of my biology teachers doesn't explain stuff very well so it doesn't make sense but this has helped me so much! Same with your other videos as well.
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Hi miss, in the OCD curve why does the saturation of oxygen start increasing at low partial pressure of oxygen? Because if lower po2 is at the tissues then why does the haemoglobin need to aquire the oxygen in the first place because isn't loading supposed to happen at the lungs and not tissues anyways? Thanks a lot!
what this means is that haemoglobin isn't unloading all of the oxygen at those tissues, only some. This is useful as it prevents wasting oxygen, as if those tissues have a higher ppO2 it means there is already some oxygen at that sight. Hope that helps 😊
Hey, partial pressure is a way to consider the concentration of gases, but it literally means the pressure that would be exerted by one of the gases in a mixture if it occupied the same volume on its own.
In the section where you mention the dove, the curve shifts to the right meaning it is easier to unload oxygen to respiring tissues but if the affinity of oxygen is decreased how will it meet the dove's metabolic requirement ?
The curve shifts to the right as there is low affinity. This means more oxygen is unloaded readily. This is favourable because it allows more oxygen to be unloaded at the tissues of the dove, so that the dove can respire further to transfer energy in the form of ATP. Metabolism is the rate of chemical reactions occurring in the body, so if the dove has a high metabolic rate, it means it produces more waste (CO2) and uses more o2. Therefore, the dove's haemoglobin has adapted using low affinity of o2.
@@jasonsingh9698 it makes more sense now, i did forget about how the co2 concentration can also effect haemoglobin which then releases the o2 in favour!
How does carbon monoxide cause less oxygen to be delivered to our muscles? Is it because CO binds to haemoglobin more strongly than O2 therefore it takes up the space instead of O2 so less O2 can bind? Or is it because CO causes O2 to bind more strongly to the haemoglobin therefore O2 can bind but its just that it can't be unloaded?
Hello do we need to know factors affecting the affinity of haemoglobin of oxygen - partial pressure of O2, saturation of heamoglobin and partial pressure of CO2
If there is little carbon dioxide present then this indicates that there is little respiration occurring, and therefore no advantage of unloading oxygen. Therefore, it is more advantageous to have a higher affinity so that the Hb can become saturated with oxygen to deliver oxygen to respiring cells where it is needed. Hope that helps.
Not every school does AS levels, so not always. Every uni focuses on particular aspects. Some heavily base decisions on gcses, others on personal statement others on predicted grade. Have a look at each universities admissions page to find out more. Hope that helps
If HbF has higher affinity for oxygen at low partial pressures, doesn't that mean it unloads oxygen less readily at respiring cells? How is that helpful
@@Alex-up8pg okay but it dissociates less readily too, so less can be taken up in respiration so what's the point since we only need oxygen for respiration?
