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O2 and Co2 Transpor

Transporting O2 and CO2

QuestionAnswer
How many molecules of Oxygen can each Haemoglobin molecule bind with? Four
Oxygen moves into the Reb blood cells by... Diffusion from the lungs.
Describe the Partial Pressure of Oxygen in the different cells of the body (3 Answers). RBC Cytoplasm: Relatively Low, Lung Cells: relatively high, Body Tissues: Relatively low.
How is a steep concentration gradient of O2 maintained between the Lungs and RBCs? Free Oxygen concentration in the Cytoplasm of the Red blood Cells is low as haemoglobin will readily bind with O2.
Under rest conditions how much (in %) of O2 is diffused out of the RBC? 25%, leaving 75% in 'storage' for times of high activity.
Name the three factors that affect diffusion of gasses in organisms: Differences in concentration of particles, size of diffusion pathway, Surface area of diffusion pathway.
State Fick's Law: Rate of diffusion is proportional to: (Surface area x Difference in concentration) / (Diffusion Distance).
State the effect on rate of diffusion when length of diffusion pathway is increased: The rate of diffusion will decrease as the substances will have to travel a larger distance.
State the effect on rate of diffusion when surface area is increased: The rate of diffusion will increase as there is a great area for diffusion to occur at any time.
State the effect on rate of diffusion when the difference in concentration is increased: The rate of diffusion will increase as particles will travel quicker down a higher concentration gradient.
Why are respiratory systems required in large organisms? Because most of their cells are too far from their body surface. Also, large organisms have developed external defences which are not suitable surfaces for gas exchange.
Created by: mjwilson1988
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