NROC61H3 Chapter : NROC61 - Ch15 textbook notes

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1 Feb 2012
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The hypothalamus sits below the thalamus, along the walls of the third ventricle. This tiny cluster of nuclei makes up less than 1% of the brain s mass. An overview of the hypothalamus y hypothalamus and dorsal thalamus are asdjacent y y a tiny lesion can produce dramatic and often fatal disruptions. The hypothalamus integrates somatic and visceral responses in accordance with the needs of the brain y homeostasis. The pituitary has two lobes, posterior and anterior. The kidneys secrete an enzyme into the blood called renin. This sets off a sequence of biochemical reactions in the blood. angiotensinogen, released from the liver, is converted by renin to angiotensin i which breaks down to form angiotensin ii. angiotensin ii directly effects the kidney and blood which increase blood pressure. The angiotensin ii is also detected by the subfornical organ y cells in this organ project axons into the hypothalamus and active the vasopressin y contain neurosecretory cells.

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