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(C) The exchange of gases ($O_2$ and $CO_2$) occurs by simple diffusion based on pressure gradients.$1$. For $O_2$,the partial pressure is higher in t

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Tissues to lungs $\quad$ Lungs to tissues

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(C) The exchange of gases ($O_2$ and $CO_2$) occurs by simple diffusion based on pressure gradients.$1$. For $O_2$,the partial pressure is higher in the alveoli $(104 \ mmHg)$ compared to the deoxygenated blood $(40 \ mmHg)$,creating a gradient from lungs to tissues.$2$. For $CO_2$,the partial pressure is higher in the tissues $(45 \ mmHg)$ compared to the blood $(40 \ mmHg)$ and alveoli $(40 \ mmHg)$,creating a gradient from tissues to lungs.$3$. Therefore,the concentration gradient for $CO_2$ is from tissues to lungs,and for $O_2$ is from lungs to tissues.

What is the direction of the concentration gradient for $CO_2$ and $O_2$ during gas exchange?
$CO_2$ gradient $\quad$ $O_2$ gradient

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What is the direction of the concentration gradient for $CO_2$ and $O_2$ during gas exchange?$CO_2$ gradient $\quad$ $O_2$ gradient