0
Each heart contraction begins in a small group of cardiac muscle cells called?
Wiki User
∙ 9y ago
The sinoatrial node is the small group of cardiac muscles that initiates each heart contraction.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
What structure allows for uniform contraction of the cardiac muscle?
Intercalated discs
This muscle type has interlocking cells for more efficient contraction?
neuroglial
What kind of tissue contracts?
Muscle tissue specializes in contraction. This includes cardiac, smooth, and striated.
Why cardiac cells do not divide?
Cardiac tissue is a very special type of muscle tissue in that it acts like muscle AND like nerve, in order to allow for the wave of contraction to spread from one part of the heart to the other after the SA node (pacemaker) signal is received, allowing for the proper pumping action throughout the heart chambers. If cardiac muscle were allowed to divide, then branched structures of cardiac muscle could form, which could interfere with this carefully regulated contraction wave, and it could result in fibrillations. This very situation happens quite often after a myocardial infarction (blockage to the coronary arteries leading to heart attack) results in some damage to cardiac muscle, and then medical intervention allows for the person to be resuscitated. While the some of the cardiac muscle dies due to lack of oxygen supply to the cells, when oxygenated blood supply is returned, and pulse is restored, some of the cells that were inactive for a while can begin beating out of rhythm with the rest of the heart, resulting in a contraction wave that works against the overall contraction wave of the heart, leading to fibrillations (irregular contraction waves moving across the heart, not in sync with one another)...which results in no proper flow of blood into and out of the heart...requiring defibrillation to stop all cardiac contraction, allowing the brain to restart the heart and restore proper cardiac rhythm.
Which tissue has intercalated discs?
cardiac muscles/involuntary muscle
Cardiac muscle strength?
Cardiac muscle has the ability to rapidly adapt the strength of contraction based on how much stretch there is in the muscle.
Does cardiac electrical activity immediately precede the contraction of the cardiac muscle?
Yes
What type of muscle show rythemic contraction?
Cardiac muscles.
Basic unit of contraction in skeletal and cardiac muscle?
The Sarcomere
The portion of the nervous system that most closely associated with the contraction of cardiac muscle is The?
The portion of the nervous system that is most closely associated with the contraction of the cardiac muscle is the autonomic nervous system.
What does the muscle tissue do in the heart?
Muscle tissue, also called cardiac muscle, are striated and highly resistant to fatigue, thus enables contraction and relaxation which involved in pumping blood.
What is the maximum rate of contraction in normal cardiac muscle fibers?
What_is_the_maximum_rate_of_contraction_in_normal_cardiac_muscle_fibers
What is the definition for myogenic?
myogenic refers to the contraction of cardiac muscle cells.
What structure allows for uniform contraction of the cardiac muscle?
Intercalated discs
Constant contraction of a muscle is?
constant contraction of a muscle is called the muscle tone
This muscle type has interlocking cells for more efficient contraction?
neuroglial
What is automaticity of the heart?
The property that allows any cell in the cardiac muscle to begin an action potential, or a cardiac conduction, leading to cardiac contraction.
