Question

fill in the blank question
if levels of calcium drop too low in the blood, the parathyroid gland secretes parathyroid hormone. when levels of calcium return to normal, the secretion of parathyroid hormone stops. this is an example of blank feedback humoral control

Explanation:

When calcium levels change, the parathyroid gland's hormone - secretion adjusts accordingly. This is a negative feedback mechanism as the response counteracts the initial change (low calcium levels). In humoral control, hormones are involved in regulating physiological processes. Here, parathyroid hormone is secreted in response to a change in blood - calcium levels, which is a humoral factor. So it is negative feedback humoral control.

Answer:

negative