Describe a Negative – feedback mechanism in terms of receptor

Laboratory Assignment 1 1. Describe a negative – feedback mechanism in terms of receptor, control center and effector. Give an example of a negative – feedback mechanism in the body. 2. Describe positive feedback. Why are positive – feedback mechanisms generally harmful? Give one example each of a harmful and a beneficial positive – feedback mechanism in the body.

3. Describe the anatomical position. Why is it important to remember the anatomical position when using directional terms?

4. Define and give an example of the following directional terms: inferior, superior, anterior, posterior, dorsal, ventral, proximal, distal, lateral, medial, superficial and deep. 5. A bullet enters the left side of male, passes through the left lung, and lodges in the heart. Name in order the serous membranes and the cavities through which the bullet passes.