Carbon dioxide increases acidity when dissolved in water e.g. in blood as it reacts with the water to form carbonic acid which has a slightly acidic pH.
Hip, spine and wrist I think.. not too sure.
But hopefully it helps :))
Primarily, it detects peptidoglycan, which is present in a thick layer in Gram-positive bacteria. ... In Gram-positive bacteria, the cell wall is thick (15-80 nanometers), and consists of several layers of peptidoglycan. They lack the outer membrane envelope found in Gram-negative bacteria.
Link:https://courses.lumenlearning.com/boundless-microbiology/chapter/cell-walls-of-prokaryotes/
Note: This information has been taken out of a website.
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Carbohydrates are not important as a stimulus in the gastric phase of gastric secretion, whereas distension, peptides, and low acidity are.
