An increase in volume return to the heart results in a decrease in stroke volume and cardiac output. An increase in plasma osmolality will cause more secretion of ADH. Describe what occurs to the urinary system in response to hemorrhaging. Be certain to include how the change in blood pressure is detected within the renal system and the steps involved in returning blood volume back to homeostasis. What happens to the oxyhemoglobin dissociation curve when temperature rises and pH falls? Explain why.