Question

1. Which of the following is true of the anterior pituitary but NOT the posterior pituitary?

a. It is composed of neural tissue

b It is controlled by the hypothalamus

c. It synthesizes steroid hormones

d. It synthesizes peptide hormones

e. It secretes neurohormones

2. Which of the following is true of the classical model of steroid hormone action but NOT the non-classical model?

a. steroids travel through the blood to reach target cells

b. steroids bindto receptors inside target cells

c. binding of a steroid to its receptor activates a signal-transduction pathway

d. Effects on behavior and physiology occur within minutes

e. none of the above

Answer 1

1. Option d is the correct answer. Anterior pituitary produces hormone while posterior pituitary does not produce hormones rather it stores and secrets hormones synthesized by hypothalamus. The hormones synthesized by anterior pituitary includes adrenocorticotropic hormone, growth hormone, prolactin, follicle stimulating hormone. These all are peptide hormones. Adrenocorticotropic hormone further stimulate adrenal gland to produce steroid hormones.

2. Option b is the correct answer. According to classical model of steroid hormone mode of action, steroid hormones get enter inside the cell and then enters within the nucleus to bring the changes at genomic level. Non-classical model represents the binding of steroid hormones to the receptor present on the membrane leading to activation of many enzymes which ultimately results in responses.