What is distinctive about cardiac muscle?

Answer 1

Unique anatomical feature of the Heart muscle is the presence of intercalated discs. They hold the heart cells together and allow the conduction of impulses between the cells. Also cells have a high quantity of mitochondria, for the provision of energy.

Answer 2

1. these are the involuntary muscles which show rhythmic contraction and relaxation through out the life.

2. these muscles are composed of non- tapering cells with faint cross striations.

3. they do not get easily fatigued by normal activities.

4. they are cylindrical, branched and uninuclead.

Answer 3

Cardiac muscle is unique in that it shows some features of skeletal muscle and some features of smooth muscle. As the name implies, cardiac muscle is the muscle that makes up the wall of the heart. Cardiac muscle is similar to skeletal muscle in that it is striated and multinucleate, and similar to smooth muscle in that the nuclei are centrally located and many cells are required to span the length of the muscle. It differs from both skeletal muscle and smooth muscle in that its cells branch and are joined to one another via intercalated discs. Intercalated discs allow communication between the cells such that there is a sequential contraction of the cells from the bottom of the ventricle to the top, facilitating maximal ejection of blood from the ventricle during contraction. This occurs with out nervous innervation to each cell or group of cells. Cardiac muscle also differs from the other two muscle types in that contraction can occur even without an initial nervous input. The cells that produce the stimulation for contraction without nervous input are called the pacemaker cells.

Answer 4

The muscle has unique features that are only in the heart.

These muscles are involuntary striated muscle which are only found in the wall of the heart. This is specialized muscle that can contract, Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves.

Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity.

Answer 5

cardiac muscles are involuntary muscles.

they are higly vascularised ,they got intercalated discs.

pacemaker cells for electrical conduction.

contraction of cardiac muscle lasts longer compared to skeletal muscle.

Answer 6

T-tubules are at the Z line and include diads instead of triads. Cardiac muscle is also single nucleated cells. Cell junctions exist as intercalated disks. Action potential excitation requires a pre calcium stimulation from extracellular sources. It them opens Ca++ channels in the sarcoplasmic reticulum allowing for contraction of muscle.

Answer 7

one unique anatomical feature of cardiac muscle is

Answer 8

The heart is composed of striated smooth muscle tissue.

Answer 9

it has to work all the time no rest