BIO 12 Lecture Notes - Lecture 25: Breastfeeding, Blood Pressure, Median Eminence
Document Summary
Detected by osmoreceptors in hypothalamus determines whether or not. Makes people urinate more (decreased adh, decreased signalling) Oxytocin-secreting endocrine cells in the hypothalamus release hormone from the posterior pituitary: doesn"t always want to maintain homeostasis. Stimulates the contraction of the uterine muscle to aid in labour: example of positive feedback cycle, stimulus: baby"s head pushing in lower uterus, stimulates oxytocin, further contracts muscles. Important for ejection of milk after parturition: secreted in response to suckling, causes smooth muscle contraction for milk ejection in breast tissue. Neurosecretory cells release hormones into capillary bed at the median eminence. Axons are projecting to cells right at the base of the hypothalamus: triggers modified neurons in the anterior pituitary. Hormones released from the anterior pituitary are synthesized and secreted by cells in the anterior pituitary. Hypothalamic neurons anterior pituitary synthesizing and releasing its own hormone response. Hormones are released in order to have a downstream target somewhere (when needed)
