During the summer season, which hormone concentration is maintained at a high level?
ADH is also called vasopressin. During the summer season, Osmoreceptors in the body are activated by changes in blood volume, body fluid volume, and ionic concentration.
An excessive loss of fluid from the body due to dehydration can activate these receptors which stimulate the hypothalamus to release antidiuretic hormone (ADH) or vasopressin from the neurohypophysis. ADH facilitates water reabsorption from the latter parts of the tubule, thereby preventing diuresis. So Vasopressin is maintained at high concentrations during summer.