Parathyroid hormone (PTH) is secreted in response to a drop in the calcium level in the blood. The secretion of PTH is regulated by a negative feedback mechanism. What can you expect to happen to the...

Parathyroid hormone (PTH) is secreted in response to a drop in the calcium level in the blood. The secretion of PTH is regulated by a negative feedback mechanism. What can you expect to happen to the calcium blood level as increased amounts of PTH are secreted, and why?

Students of an anatomy class are preparing to dissect a body to reach the heart. In which cavity is the heart located, and how can they gain access to it?