Q4: Nervous control of heart rate Flashcards
Autonomic nervous system
controls the involuntary activities of internal muscles and glands
Autonomic meaning
self governing
Two divisions of the autonomic nervous system
sympathetic nervous system
parasympathetic nervous system
The sympathetic nervous system
Stimulates effectors and speeds up any activity,
The sympathetic nervous system
acts as
an emergency controller
fight or flight
The sympathetic nervous system
controls
controls effectors when we exercise strenuously or experience powerful emotions
The parasympathetic nervous system
Inhibits effectors and slows down any activity.
The parasympathetic nervous system
controls
activities under the body’s normal resting conditions,
The parasympathetic nervous system
concerned with
conserving energy and replenishing the body’s reserves
The sympathetic and parasympathetic nervous systems
relationship
antagonistic
SAN
sinoatrial node
Sinoatrial node
A group of cells within the right atrium of the heart where the initial stimulus for contraction originates.
The sinoatrial node has
a basic rhythm of stimulation that determines the beat of the heart
AVN
atrioventricular node
Location of the atrioventricular node
lies between the atria
