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. calcitonin-thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone. thyrocalcitonin. thyroid hormone-any of several closely related compounds that are produced by the thyroid gland and are active metabolically.