Which of the following is TRUE about shock?1.82 pts It is caused by excessively high blood pressure It results from inadequate blood flow to tissuesO Drugs or physiological mechanisms that cause vasoconstriction will make shock worse Negative feedback involved in regulating blood pressure will cause shock to become progressive and maybe even irreversible.
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Which of the following statements concerning regulation of blood flow is TRUE? Multiple Choice In the systemic circuit, increased levels of metabolic waste products and decreased oxygen concentration in tissues promote hyperemia through the tissues. If blood flow to a tissue is blocked for a period of time and then the block is removed, the result is a reactive hyperemia in which blood flow through the affected tissue remains low. According to flow autoregulation, if blood pressure to an arteriole is decreased, blood flow will not return toward its original level until the original blood pressure is restored. In the systemic circuit, high levels of CO2 and metabolites tend to cause contraction in the smooth muscle of arteriole walls. The resistance to blood flow in brain and heart vascular beds does not vary in response to changes in local gas or metabolite concentrations.
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Patient Z suffers a significant cut, losing more than a liter of blood, and causing an immediate drop in blood pressure. Describe how the heart responds to bring blood pressure back to normal? Describe the negative feedback reflex and neuroendocrine control system that causes this cardiac response to the blood loss. How does the vasculature respond to blood loss to help restore blood pressure? What hormones and neuroendocrine output increase or decrease to cause these responses of the vasculature? If blood pressure drops by 20% and cardiac output doesn't change, how much does total peripheral resistance need to change (and in what direction) to restore blood pressure? In shock, the negative feedback pathways are not able to keep blood pressure sufficiently high, leading to positive feedback patterns that can lead to death. Describe and explain the positive feedback effects of shock on the heart.
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