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Haemodynamic response
In haemodynamics, the body must respond to physical activities, external temperature, and other factors by homeostatically adjusting its blood flow to deliver nutrients such as oxygen and glucose to stressed tissues and allow them to function. Haemodynamic response (HR) allows the rapid delivery of blood to active neuronal tissues. Since higher processes in the brain occur almost constantly, cerebral blood flow is essential for the maintenance of neurons, astrocytes, and other cells of the brain.
==Vascular anatomy overview==
In order to understand how blood is delivered to cranial tissues, it is important to understand the vascular anatomy of the space itself. Large cerebral arteries in the brain split into smaller arterioles, also known as pial arteries. These consist of endothelial cells and smooth muscle, and as these pial arteries further branch and run deeper into the brain, they associate with glial cells, namely astrocytes and pericytes. The intracerebral arterioles and capillaries are unlike systemic arterioles and capillaries in that they do not readily allow substances to diffuse through them; they are connected by tight junctions in order to form the blood brain barrier (BBB). Endothelial cells, smooth muscle, neurons, astrocytes, and pericytes work together in the brain order to maintain the BBB while still delivering nutrients to tissues and adjusting blood flow in the intracranial space to maintain homeostasis. As they work as a functional unit, alterations in their interactions at the cellular level can impair HR in the brain and lead to deviations in normal nervous function.〔Iadecola, Constantino. "Neurovascular Regulation in the Normal Brain and in Alzheimer's Disease." Nature Reviews, Neuroscience 5 (2004): 347-49. 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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