VETS20015 Lecture Notes - Lecture 3: Cardiac Output, Adrenal Medulla, Adrenocorticotropic Hormone

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Biological state of animal as it cope for the environment. May directly reflect the environmental challenge for the animals. Can indicate risk of further adverse welfare. The greater the gap between actual and optimum environmental conditions the greater the response. Learning increases predictability and reduces the magnitude of stress responses. As much a neural as an endocrine response. Activated by a perceived threat (control retained) Fight or flight response: hpa (hypothalamo-pituitary adrenocortical) Stimulus brain sympathetic nervous system adrenal medulla adrenalin/noradrenalin(epinephrine and norepinephrine) (a type of catecholamine) Effects of adrenalin and other catecholamine hormones. Increased blood flow to muscles (e. g. skeletal muscle is essential. Decreased blood flow to gastrointestinal system (guts are less essential. Blood supply is diverted from less essential area tso essential area. Stimulus brain(hypothalamus(receive neural input) crh release pituitary acth release(travelled by mainstream circulation) adrenal cortex cortisol (a type of glucocorticoid hormone) release. Effects of cortisol and other stress induced glucocorticoid hormones.

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