Electrochemical systems of CVS Flashcards
What does the neural regulation of cardiovascular system
Autonomic nervous system
What do motor neurons do in ANS
Innervates smooth muscle, cardiac muscle, internal organs and skin
Makes adjustments to ensure optimal support for body activities
What does motor neuron of ANS have as effector
Viscera
What neurotransmitter do somatic motor neurons release in SNS
ACh
Has excitatory effect
What neurotransmitter are released in ANS
Preganglionic fibres release ACh
Postganglionic fibres release noradrenaline or ACh - effect either stimulators or inhibitory
What is the parasympathetic division
Concerned with keeping body energy use low
Largely innervates the internal organs - not he skin
Neurotransmitter = ACh at both ganglionic and effector organs
What is the Sympathetic division
Concerned with high energy use
Promotes adjustments during exercise
Innervates every part of the body
Neurotransmitter = ganglionic is ACh, effector organ neurotransmitter is noradrenaline
What is the sinoatrial node
Auto rhythmic cells in right atrium near entry of the SVC
What is atrioventricular node
Autorhythmic cells near the floor of the right atrium
How are SA and AV nodes connected
Internodal pathways through which electrical activity spreads rapidly
Where is the bundle of His
Wall of septum between ventricles
What does the bundle of His divide into
Left and right branches which continue downwards and divide into many small Purkinje fibres
Which tissue possesses the highest degree of automaticity
SA node
Creates impulses at highest frequency and normally suppresses the other elements
What does the p wave represent
Atrial depolarisation
What is the QRS complex
Ventricular depolarisation
