Since it is a light-absorbing pigment, chlorophyll is called a photoreceptor. Also note that there are two types of chlorophyll: chlorophyll a and chlorophyll b. Function. Chlorophyll molecules are contained inside chloroplasts, which are the food producers of the cell found
Calcitonin has an opposite effect, as it decreases the levels of calcium in the blood. Overall, PTH has a strong effect on the blood concentration of calcium, whereas calcitonin has a more moderate effect and is not critical in helping the body maintain normal blood calcium levels.
And since calcitonin is antagonistic, does it inhibit osteoclast activity? (And would the opposite system apply to osteoblasts?) My reasoning is that PTH increases calcium levels in the blood, which means it induces osteoclast activity because osteoclasts break down bone and subsequently release calcium in the blood.