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hormones are classified according to their chemical composition what are they
1. polypeptide hormones
2. amine hormones
3. steroid hormones
what is the location of the baroreceptors there are 2
when does insufficient/incompetent valve occur and what noise does this make
when valves cannot close properly so backflow of blood causes turbulence
noise- swishing gurgling
what is vasodilation caused by
circulating adrenaline from the sympathetic nervous system acts on beta 2 receptors
what is the relationship between blood flow pressure and resistance
blood flow= perfusion pressure/total peripheral resistance
blood flow is proportional to
and total peripheral resistance is proportional to
blood flow is proportional to radius to the power of 4
TPR is proportional to 1/radius to the power of 4
name the blood vessels of the cardiovascular system in order largest to smallest
when does stenotic valve occur and what sound does it make
when the valves are stiff and narrow so they cant open properly so blood is forced with high pressure makes a whistling noise
examples of steroid hormones
1. testosterone
2. oestrogen
3. progesterone
4. cortisol
5. cholesterol
what is vasoconstriction caused by
it is caused by vasomotor fibres of the sympathetic nervous system releasing noradrenaline which acts on alpha one receptors
examples of polypeptide hormones
1. anti-diuretic hormone
2. oxytocin
The Korotkoff sounds are generated by
turbulent blood flow through the brachial artery
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