5. Control Of Heart Rate Flashcards
What is the nervous system split into ?
Central nervous system and peripheral nervous system.
What is CNS made up of ?
Brain and spinal cord.
What is peripheral nervous system made up of ?
Neurones that connect CNS to rest of body.
What is the peripheral system split into ?
Somatic
Autonomic
What does somatic nervous system control ?
Conscious activities
Running
What does autonomic nervous system control ?
Unconscious activities
Digestion
Control of heart rate
What is the autonomic system split into ?
Sympathetic
Parasympathetic
Both have opposite effects on body.
What is the sympathetic nervous system?
Fight or flight System getting body ready for action.
What is the parasympathetic system ?
Rest or digest system.
Calms body.
Summarise nervous system
CNS
Peripheral - somatic and autonomic - sympathetic and parasympathetic
Sympathetic stands for …
Stress
Parasympathetic stands for …
Peace.
What is the cardiac muscle an example of ?
Myogenic
What does myogenic mean ?
Contract and relax without signals from nerves.
Patterns of contractions controls regular heart.
Where does process initially start for control of heart beat?
Sinoatrial node
SAN
What is the SAN?
Small mass of tissue in wall of right atrium.
Pace maker as sets rhythm of heartbeat sending out regular waves of electrical activity in atrial walls.
Contraction of right / left atria at same time.
What does a band of non conducting collagen do ?
Prevents waves of electrical activity from being passed directly from atria to ventricles.
Instead , where are waves of electrical activity transferred to?
From SAN to atrioventricular node AVN
What is AVNs function ?
Passing waves of electrical activity on to bundle of his.
Why is there a slight delay in transferring waves of electrical activity to bundle of his?
Make sure atria have emptied before ventricles contract
