Psychology 2220A/B Lecture Notes - Lecture 12: Gonad, Dihydrotestosterone, B Cell

• School: Western University
• Department: Psychology
• Course: Psychology 2220A/B
• Professor: Scott Mac Dougall- Shackleton

Document Summary

Endocrine glands: ductless glands, exocrine glands have ducts. E. g. sweat glands, mammary glands, scent glands. Secreting cell --> blood vessel --> target cell. Target cells: hormones require receptors to have actions. Neurohormones: released from neurons (neurosecretory cells, travel through blood, received at distant target organ, not hormones; not produced by an endocrine gland. Chemical messengers: hormones, neurohormones, neurotransmitters, the same molecule may act as more than one type, depending on nature of secretory cell, adrenaline aka epinephrine; released by the adrenal medulla. Hormone action: hormone action via 2 main processes, water soluble hormones (e. g. peptides) Cannot cross cell membranes on their own; bind to receptors on the external part of the cells: fat soluble hormones (e. g. steroids) Liophilic; trouble getting transported in blood plasma. Water soluble hormones: cannot cross cell membranes, bind to membrane receptors, initiate 2nd messenger system within cell. Pretty much like a neurotransmitter binding to a metabotropic receptor! Float in cytoplasm waiting to bind to receptor.