Download Properties of Cardiac Muscle

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Properties of Cardiac Muscle
Dr. Mahvash Khan
MBBS, Mphil
• Automaticity means the ability of the cell to
undergo depolarization spontaneously causing
the production of electrical impulses
• Rhythmicity means that spontaneous
depolarization occurs at regular intervals
• Conductivity is the ability to propagate an
• Normally impulses are conducted in one
• Conductivity may be increased or decreased
under various circumstances
• Cradiac muscle contracts in response to the
electrical impulse generated by the SA node
Refractory Period
• The refractory period of the myocardial fibers
is of much longer duration than that of
skeletal muscle fibers and lasts approximately
as long as the cardiac contraction
• The heart muscle responds to stimuli which
may be mechanical, electrical or chemical
All or None Law
• Heart is a functional syncytium therefore all its
fibers act as a single fiber
• Heart either does not contract at all or it
contracts with full force
Frank Starling Law of the Heart
• This law states that with in limits the force of
ventricular contraction is directly proportional
to the end-diastolic length of the cardiac
muscle fibers which inturn is closely related to
ventricular end-diastolic volume
Document related concepts

Quantium Medical Cardiac Output wikipedia, lookup

Myocardial infarction wikipedia, lookup

Coronary artery disease wikipedia, lookup

Management of acute coronary syndrome wikipedia, lookup

Arrhythmogenic right ventricular dysplasia wikipedia, lookup

Electrocardiography wikipedia, lookup

Heart failure wikipedia, lookup

Heart arrhythmia wikipedia, lookup

Ventricular fibrillation wikipedia, lookup

Cardiac contractility modulation wikipedia, lookup