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. 2. Would you expect a male to have estrogen 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 testis would not. 3. Label the endocrine glands (A-D) A: Thyroid gland B: Adrenal gland C: Kidney D: Pancreas 3. Label the endocrine glands (A-C) A: Pineal gland B: Hypothalamus C: Pituitary gland 4. Explain the concept of negative feedback and how it helps to maintain homeostasis. The impact of or increased level of the hormone acts to stop the continued release of the hormone. The brain is always monitoring hormone levels to hold levels within a particular range or set-point. In other words, to keep hormones in homeostasis. Negative feedback is a way of shutting off hormone production when the desired level is reached. 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 isthe action of oxytocin causing the uterusto 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. 5. This type of hormone is derived from cholesterol: Peptide hormones Catecholamines Steroid hormones