To discuss:
How the brain regulates its blood flow and what chemical stimulus is the most potent in activating its regulatory mechanisms.
Introduction:
When compared to other organs, the brain receives less blood (of the overall blood flow), around 700 ml/min at rest. Even though the less amount of blood is received by the brain, that less volume of blood is important as it has more reliability. If blood is cut off from the brain, within few seconds it leads to oxygen deprivation and loss of consciousness occurs. This causes a major damage if the brain is not re-supplied with oxygen within five minutes (anoxia).
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Chapter 20 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- How vasomotion can change systemwideblood pressure or redirect blood flow fromone region to another; circumstances thatcall for redirection of blood flowarrow_forwardhow positive feedback helps to prevent excessive blood loss after a blood vessel has been injured.arrow_forwardsignificance and mechanisms of local neural control of cerebral blood flowarrow_forward
- The mathematical relationship between peripheral resistance and vessel radius; why this is related to the laminar flow of blood; and why it makes vasoreflexes such a powerful influence on blood flowarrow_forwardWhat arrhythmia would result from damage to the atrioventricular node that slows conduction through that structurearrow_forwardA typical value for cerebral blood flow and why its constancy is importantarrow_forward
- Renin-angiotensin system; its role in regulation of the blood pressure.arrow_forwardWhat an electrical current is, and how sodium ions and gated membrane channels generate a current.arrow_forwardSympathetic nervous system stimulation cases which of the following during exercise? vasodilation and venodilation vasodilation vasoconstriction and venoconstriction vasoconstrictionarrow_forward
- circulation in fish, amphibians and mammals. an explanation of the kind of circulation used by each animal.arrow_forwardHow pulmonary circulation differs fromsystemic circulation with respect to bloodpressure, capillary exchange, relative oxygenation of arterial and venous blood, andthe vasomotor response to hypoxiaarrow_forwardhow five variables change over time when blood volume decreasesarrow_forward
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