For this question
Explain why breathing in and out increases the rate of oxygen diffusion into the blood
This is the answer but I don’t really understand it
As we breathe in and out we are refreshing the oxygen concentration on the lungs which makes the concentration gradient steeper and this will increase the rate of diffusion
Dissolved gases are in equilibrium of course. So having more of a certain gas increase the rate at which it dissolves into liquid. When we breathe, we inhale both CO2 and O2, but our exhaled breath is filled with more CO2 because we've depleted the oxygen supply by using it up during cellular respiration. Since we're using up the O2, we want to replenish it by inhaling more. The less O2 we have in the blood, the more it increases the rate of diffusion. If I wrote out an equilibrium, O2 + deoxygenated blood <-> oxygenated blood if you decrease the oxygen in the blood, you push O2 into the deoxygenated blood. They talk about a "concentration gradient" in the answer. It's kinda helpful to think about there being a bigger hole, so to speak. If you imagine oxygen like flowing water, the bigger the hole, the more water that falls into the hole.
So basically, because when we breathe we change the concentration of oxygen and CO2 in the lungs like, when we breathe in, there's more oxygen in our lungs relative to in the blood diffusion gradient steep so diffusion rate fast.
because in diffusion, the goal is to reach equal concentration across both sides, right
Ahhh I love muji pens!! We have the same taste in stationary!! (I haven't been using mine much because I'm worried they'll run out of ink haha
That is the exact same as me!! I don't like using my good pens because I get worried they'll run out of ink! XD