Blood Flow to Brain

Blood Flow to Brain - Blood Flow to Brain blood flows to...

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Blood Flow to Brain: - blood flows to brain via internal carotid & vertebral arteries - internal jugular veins return blood to heart from head - blood-brain barrier: capillaries serving brain tissue have tighter junctions than most capillaries of body; let very little through o bloodborne substances within capillaries of brain separated from extracellular o selective barrier: allows diffusion of nutrients but not metabolic wastes to enter brain tissue o some beneficial drugs (for brain cancer or infections) also cannot pass o brain injury or infection/inflammation may result in localized breakdown of blood-brain barrier Brain Disorders: - concussion : slight brain injury with mild short-lived symptoms - contusion : more severe brain tissue destruction; may produce coma - subdural/subarachnoid hemorrhage
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Blood Flow to Brain - Blood Flow to Brain blood flows to...

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