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.
1 Produced in the parafollicular cells of the thyroid gland, calcitonin acts to correct hypercalcemia by directly opposing the effects of PTH by inhibiting intestinal absorption of calcium, inhibiting osteoclastic activity and inhibiting reabsorption of calcium in the nephron.