Hormonal Communication
- Created by: rainbows
- Created on: 08-06-17 11:47
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- Hormonal Comm.
- Endocrine Glands
- Cells specialised to release hormones into blood
- Stimulated by:
- change in conc. of a sub.
- another hormone
- nerve impulse
- E.g. adrenal/pancreas
- Hormones
- Chem. messengers in blood
- travel to target cells and bind to specific receptors
- Steroid
- lipid soluble
- can pass plasma membrane
- bind to steroid hormone receptors
- form steroid-hormone complex
- transcription factor
- form steroid-hormone complex
- E.g. oestrogen
- lipid soluble
- Non-steroid
- Bind to receptors on cell surface membrane
- trigger cascade reactions via second messengers
- hydrophilic
- E.g. Adrenaline
- Bind to receptors on cell surface membrane
- Hormonal VS Nervous
- comm: hormones - nerve impulses
- Transmission:blood + slow - neurones + fast
- Travels to: all parts - specific parts
- Response: widespread, slow, long term - localised,fast,short term
- Effect: permanent, irreversible - temporary, reversible
- Adrenal Glands
- Cortex
- releases hormones vital to life
- mineralcorticoids
- aldosterone
- helps control BP
- By maintaining balance between salt and water concs. in blood and body fluids
- release controlled by signals from kidney
- helps control BP
- aldosterone
- glucocorticoids
- cortisol
- reg. metabolism
- controls how body fats -> energy
- reg. BP and cardiac function
- reg. metabolism
- corticosterone
- reg. immune system and suppresses inflammatory response
- cortisol
- androgens
- male + female sex hormones
- mineralcorticoids
- releases hormones vital to life
- Medulla
- Hormones released when SNS stim, - stress
- Adrenaline
- ^ HR
- ^ blood to muscles and brain
- ^ glucose concs via glycogenolysis
- ^ HR
- Noradrenaline
- works with adrenaline
- ^HR, widens pupils, widens air passages in lungs,
- vasoconstriction to non-essential organs to ^BP
- Adrenaline
- Hormones released when SNS stim, - stress
- Cortex
- Endocrine Glands
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