endocrine system
Cards (7)
- endocrine systeminstructs glands to release hormones directly into the bloodstreamthe hormones are carried towards the target organs in the bodyacts slower but more widespread than nervous system
- example of hormonethyroxine produced by the thyroid glandaffects cells in the heartincreases heart ratealso affects cells in the body increasing metabolic ratesin turn affects growth rates
- fight or flight responsewhen a stressor is perceived the hypothalamus activates the pituitary glandtriggers activity in the sympathetic branch of the autonomic nervous systemANS changes to the psychologically aroused sympathetic state
- adrenalinereleased from adrenal medullatriggers physiological changes in the bodye.g increased heart ratecreates physiological arousal for flight or fight response
- immediate and automaticthe flight or fight response happens as soon as the threat is detectedis an acute response and is automaticthe body moves to the sympathetic state (e.g. increased heart rate, breathing rate)
- parasympathetic actiononce the threat has passed the parasympathetic Ns returns the body to its resting stateworks in opposition to sympathetic systemacts as a brake and reduces the activities of the body that were increased by the actions of the sympathetic branchreferred to the rest and digest response
- hormonebiochemical substance that circulates in the bloodonly affects target organsproduced in large quantitiesvery powerful effects