Blood

simple defination The blood pH range of $\text{7.35 to 7.45}$ represents about an $\text{11\%}$ difference in the number of acid molecules. One pH unit represents $\text{100\%}$ difference.

The extremes of the $\text{7.35 to 7.45}$ range are somewhat compatible with life, but healthy people will have blood pH closer to $\text{7.37 to 7.40}$ . There is also a fairly consistent 0.03 pH difference between arterial blood pH (being discussed here) and venous blood pH. Venous blood contains more $\large{CO_2}$ and lactic acid, which makes it slightly more acidic.

Orange juice has roughly $\text{1000}$ times more acid molecules than blood. Lemon juice might be ten times higher, and stomach acid at least ten times higher again. So $\text{11\%}$ variation in acid molecules is tiny indeed.

While it is true that acids can corrode metals, this is not so much about acidity as it is about redox $\color{#3D99F6}{(oxidation-reduction)}$ reactions. While there is an slight "overlap" of acid and oxidation $\text{(and alkali and reduction)}$ , they are far more different than they are similar.

I'd also like to point out that plaque comes in soft and hard forms. Soft plaque is largely lipids $\text{(fatty acids, fats, cholesterol and cholesterol esters)}$ , which might be dissolved by some kind of detergent, such as a phospholipid $\color{#3D99F6}{(Phosphatide)}$ . But when plaque is hardened by deposition of calcium, it becomes akin to concrete and is highly resistant to dissolving by detergents. This is why abnormal calcium metabolism is an especially troublesome aspect of cardiovascular disease. all situation of blood ph.

Hence the answer is $\color{#456461}{true}$ .