Question

Neuroendocrine mechanisms control homeostasis. Describe a homeostatic regulation that involves both neural and hormonal regulations. (7pt)

Name the homeostatic function to be regulated. (1pt)

Name the tissue/organ involved (1pt)

Name the neural and hormonal factors involved (2pt)

Describe how each of these neural and hormonal factors regulate the organ/tissue's function (3pts)

Answer 1

The example of neuroendocrine mechanism is hormones released from posterior pituitary.

The posterior pituitary does not secret any hormone. ADH and oxytocin are synthesized in the hypothalamus. From hypothalamus, these two hormones are transported to the posterior pituitary via nerve fibres of hypothalamo-hypophyseal tract.  

Now taking example of ADH

ADH is secreted by supraoptic nucleus of hypothalamus. From here, it is transported to posterior pituitary.

The main function of ADH is retention of water by acting on kidneys. ADH increases reabsorption of water from distal convulated tubules and collecting duct. When level of water in plasma reduces, it stimulate production of ADH .

Thus ADH is responsible for maintenance of water homeostasis in body