BIOD 151 Module 6 Exam – Portage Learning

A and P 151 Module 6 Exam 1. Explain two reasons why a woman with low levels of LH would not be able to become pregnant: (1) LH acts on the ovary to cause ovulation to occur. (2) LH causes progesterone release to facilitate potential fertilization of the egg and pregnancy. Progesterone is a key hormone for the maintenance of pregnancy. 2. Would you expect a female to have testosterone in their bloodstream? Explain why or why not: (1) Yes. Both male and female bodies produce “all” the sex hormones. However, the ratios are different. (2) The adrenal glands are largely responsible for producing this “opposite” hormone that the ovaries would not. 3. Label the endocrine glands (A-C): A: Pineal gland B: Hypothalamus C: Pituitary gland 4. Explain the concept of positive feedback. Give an example of a hormone that works through positive feedback: 1- Positive feedback is the action of a hormone increasing the production of that hormone. (This is the opposite of negative feedback). 2- One example is the action of oxytocin causing the uterus to contract during labor. Oxytocin enhances the effect of the uterus contractions, causing more oxytocin to be released. The positive feedback loop is stopped once the baby is born and the uterus no longer needs to contract, stopping the production of oxytocin.