Endocrine system -adrenaline
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- Created by: vezting
- Created on: 21-04-16 18:52
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- endocrine system
- hormones
- molecules that are released by endocrine glands directly into the blood acting as messengers to specific traget organs or tissues
- there are two types of hormone
- proteins and peptides, (not soluable in phospholipid membrane) Eg adrenaline, insulin, glucagon
- steroid hormones ( have direct effect on nucleus and can enter the cell) Eg sex hormones
- endocrine is direct into the blood
- exocrine secretes into a duct that carries the molecule to where they are used
- adrenaline
- is an amino acid derivative and is associated with a receptor on inner membran called adenyl cyclase
- adrenaline binds to its specific receptors on the cell surface membrane, it is the first messener molecule
- it activates adenyl cyclase which coverts ATP into cAMP which is the secondary messenger
- adrenyl gland
- medulla is at the centre and makes and releases adrenaline in times of shock or stress
- adrenyl cortex uses colesterol to produce certain steroids
- relaxes bronchiole muscles
- increases stroke volume
- heart rate increases
- pupil dialation
- inhibits gut action
- hormones
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