BIO210Y5 Lecture Notes - Lecture 13: Hypophyseal Portal System, Thyroid, Adrenal Medulla
Document Summary
Ion, solutes, lipid-soluble material exchange between adjacent cells via tight junction (cells stuck together) Limited to adjacent cells of the same type: synaptic. Neurotransmitter exchange in specific areas via synapses (nmj synapse, like in muscles) Target cells must have appropriate receptors: paracrine. Paracrine factors exchanged locally through extracellular fluid. Limited to local area where paracrine factor conc. is high. Target cells must have appropriate receptors: endocrine. Hormone exchange between distant tissues and organs via bloodstream. Target cells in distant tissues and organs. Secretes hormones for fluid balance, smooth muscle concentration, and anterior lobe hormone secretion of pituitary gland: pituitary gland. Secretes hormones for melanin production, hormones of adrenal cortex, thyroid gland, and reproductive organs: adrenal gland. Secretes hormones for mineral balance, metabolic control, and stress: pineal gland. Secretes melatonin, which affects reproductive function and circadian (day/night) rhythms. Types of hormones: amino acid derivates. Mnemonic: no do thy cat trips: peptide hormones (need membrane receptors)
