PHYSIOLOGY
CARDIAC MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The cardiac muscle cell could lift up to 96 pounds.
|
|
|
Are elongated cells and strainedCardiomyocytes are attached to each other through intercalated discs
|
|
|
They are actually made of dehydrated pickles.
|
|
|
None of the above
|
Detailed explanation-1: -Cardiac muscle cells (cardiomyocytes) are striated, branched, contain many mitochondria, and are under involuntary control. Each myocyte contains a single, centrally located nucleus and is surrounded by a cell membrane known as the sarcolemma.
Detailed explanation-2: -One other distinct feature of cardiac muscle fibers is that they have their own auto rhythmicity. Unlike smooth or skeletal muscle which require neural input for contraction, cardiac fibers have their own pacemaker cells like the sinoatrial (SA) node that spontaneously depolarizes.
Detailed explanation-3: -The individual cardiac muscle cells are tightly connected to another cell by intercalated disc. The intercalated discs appear as thin, typically twig-like structures dividing adjacent cardiac muscle cells and running perpendicular to the direction of muscle fibers.
Detailed explanation-4: -Cardiac muscle has branching fibers, one nucleus per cell, striations, and intercalated disks. Its contraction is not under voluntary control.