The body of a man contains 49.5 L of water. He drinks 0.5 L of pure water. Suppose that all of this water is absorbed, at first with negligible excretion. What is the percentage decrease in osmotic concentration of the body fluids? Given an initial concentration of 300 mOsmol/kg water, what is the absolute decrease in concentration?

A increase  B decrease

If blood pH drops toward the acidic end of the range, what would happen as a result of tubular secretion? O Increased H+ in urine. Decreased H+ in urine O Increased K+ in urine O Decreased K+ in urine.

An athlete is sweating profusely but does not rehydrate. The changing conditions are detected by osmoreceptors in the hypothalamus.Select the four conditions associated with loss of water and the response it triggers. Increased solute concentration Decreased solute concentration Increased blood volume Decreased blood volume Increased blood pressure Decreased blood pressure Increased release of ADH Decreased release of ADH

Hypocalcemia will increase the permeability of membranes to sodium.  Group of answer choices False True

Drinking a litre of water will cause the osmolarity of blood plasma to :  INCREASE OR DECREASE?

87. A patient develops increased thirst and urinary frequency shortly after head trauma. If ADH (vasopressin) deficiency is the cause, which of the following changes in osmolality is expected? Osmolality Plasma ↑ ↓ O O O O Urine A) ↑ B) ↑ ↓ ↓

Sodium and water absorption in the collecting duct has the largest effect on total body water balance because: O A. The largest change in the transport of these molecules can occur in the CD OB. The largest absorption of water amounts can occur in the CD OC. The largest absorption of Na amount can occur in the CD D. The largest change of osmolarity can occur in the CD

if An athlete has just finished an intensive sport session during which he sweated excessively and forgot to drink water. Explain how this is expected to affect his urine concentration

Blood plasma has an osmolarity of about Group of answer choices: 100 mOsm/L. 900 mOsm/L. 1200 mOsm/L. 300 mOsm/L. 30 mOsm/L.