Question

1. if one had to pick the signal at puberty that causes the beginning of ovarian and menstrual cycles, it is likely

a) body fat composition causing the release of growth hormone
b) cortisol causing the release of acth
c) gnrh causing changes in fsh and lh
d) lh causing the release of estrogen
e) fsh causing the release progesterone

1. t or f estradiol acts in a positive manner on the hypothalamic release of gnrh

a) true b) false

1. generally speaking, lipid - soluble hormones bind to ______ receptors

a) have you had the \he aint heavy hes my brother\ at the diamond deli....dot it
b) plasma membrane receptors
c) nuclear receptors
d) they do not preferentially bind to any receptors
e) soluble receptors in the blood

Explanation:

1. Gonadotropin - releasing hormone (GnRH) stimulates the release of follicle - stimulating hormone (FSH) and luteinizing hormone (LH), which initiate ovarian and menstrual cycles. Option d is correct as LH stimulates the release of estrogen from the ovaries.
2. Estradiol can have a positive feedback effect on the hypothalamic release of GnRH, especially around the time of the LH surge. So the statement is true.
3. Lipid - soluble hormones, such as steroid hormones, can diffuse through the plasma membrane and bind to nuclear receptors to regulate gene expression.

Answer:

1. d) LH causing the release of Estrogen
2. a) True
3. c) nuclear receptors