An increase in volume return to the heart results in a decrease in stroke volume

Question

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.

Explanation / Answer

1) It is true because if there is an increase in volume or venous return to the heart or if the heart rate is extremely rapid, it results in low venous return and therefore decreased stroke volume.

2) It is true. In fact, if there is an increase in the solute concentration or osmolarity of the blood, the blood become more concentrated which causes the release of antidiuretic hormone from magnocellular neurosecretory neurons in the Paraventricular nucleus of the hypothalamus (PVN) and Supraoptic nucleus (SON). The release of ADH causes an increase in the reabsorption of water, and thus causes the urine to become more concentrated and thus make blood plasma less concentrated.

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