Cardiac Triggers Flashcards
What are and where are mech receptors found
Muscle spindles
Surround muscle fibre
How do mechan work
As muscle contracts spindles deform sending afferent signals to the brain
Type III afferent receptors
Where and what activates metabo
Chemical activation
In interstium
What are metabo sensitive to
Lactate
Phosphate
Prostaglandins
Ph
What are baro sensitive to and where are they
Arterial pressure
Walls of carotid sinus and aortic arch
What do baro trigger
Decrease Sns and increase Pns
What happens with high bp
Cardio inhibitory centre stimulated
Acceleratory centres inhibited
Vasomotor centres inhibited
What happens with vasomotor centre inhibited
Vasodilation
Baro reflex paradox
Increased pressure by exercise
Reflex is reset to higher pressure
Chemoreceptors
In walls of carotid sinus and aortic arch
Sense high levels of co2
Triggers brain to increase Sns
Bain bridge reflex
Increased cardiac filling elicits tachycardia
Stretch receptors in right atria and vena cava stretch
Increased firing to brain
Increased Sns
Anticipatory response
Increased ne and epi release
Decreased Pns
What triggers the cv response
Mechanoreceptors
Metaboreceptors
Baroreceptors
Chemoreceptors
