Final answer:
Increased ADH secretion leads to a higher concentration of urine, represented by option 1. higher specific gravity, since the kidneys reabsorb more water under the influence of ADH, leading to urine that contains a greater concentration of solutes.
Step-by-step explanation:
Increased secretion of antidiuretic hormone (ADH) would normally result in the urine having a higher specific gravity. ADH is a hormone produced by the hypothalamus and released from the posterior pituitary gland. It's primarily involved in regulating the body's balance of water by controlling the concentration of urine produced by the kidneys.
When ADH levels in the bloodstream increase, the kidneys reabsorb more water, leading to a decrease in urine volume but an increase in urine concentration. As water is reabsorbed into the blood, the urine becomes more concentrated with solutes, such as salts and metabolic wastes, thus raising the specific gravity of the urine.
Urine specific gravity is a measure of the density of substances dissolved in the urine as compared to the density of pure water. Through its actions, ADH plays a critical role in helping the body conserve water and maintain proper hydration.
When ADH secretion is high, the urine will typically appear darker in color due to the higher concentration of solutes. This could be due to dehydration or other physiological stresses that increase blood osmolarity above normal levels, prompting the hypothalamus to signal for more ADH release. Therefore, the correct option for what increased ADH secretion should normally cause in the urine is higher specific gravity.