Save
...
RESPONSE TO STIMULI
CONTROL OF HEART RATE
CONTROL OF HEART RATE
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Jasmine Singh
Visit profile
Cards (4)
HOW IS THE HEART RATE CONTROLLED?
Wave
of
electrical excitation
spreads out
from
SAN
across
both atria
Atria contract
Atrioventricular septum
prevents
wave crossing
to
ventricles
Wave
of
excitation
enters
AVN
Short delay
AVN conveys wave
of
electrical excitation
between
ventricles
along
bundle
of
His
Bundle
of
His conducts wave
through
atrioventricular septum
to
base
of
ventricles
Bundle branches
into
smaller fibres
of
Purkyne tissue
Wave released
from
tissue
Ventricles contract quickly
at
same time
from
bottom
WHAT IS THE ATRIOVENTRICULAR SEPTUM?
layer
of
non-conductive tissue
WHAT IS THE AVN?
atrioventricular node
(
group
of
cells
which
lies
between
atria
)
WHAT IS A BUNDLE OF HIS?
made up of
specialised muscle fibres
(
Purkyne tissue
)
