What is the histology of cardiac muscle tissue?
Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres, just as in skeletal muscle. However, cardiac muscle is involuntary. Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions.
Where is cardiac muscle found histology?
the heart wall
Cardiac muscle is striated, involuntary muscle found in the heart wall. Cardiac muscle cells (or cardiomyocytes) contain the same contractile filaments as in skeletal muscle.
What is the structure of cardiac muscle fibers?
Cardiac muscle cells form a highly branched cellular network in the heart. They are connected end to end by intercalated disks and are organized into layers of myocardial tissue that are wrapped around the chambers of the heart.
What are the major histological differences between skeletal cardiac and smooth muscle?
Cardiac and skeletal muscle are both striated in appearance, while smooth muscle is not. Both cardiac and smooth muscle are involuntary while skeletal muscle is voluntary.
What is the appearance of the cardiac muscle?
Cardiac muscle is characterized as striated muscle because microscopically, it presents a striated appearance essentially identical to that of skeletal muscle; it also shares with skeletal muscle many similar ultrastructural features.
What organelles are in cardiac muscle cells?
Cardiac muscle cells also contain mitochondria, which many people call “the powerhouses of the cells.” These are organelles that convert oxygen and glucose into energy in the form of adenosine triphosphate (ATP). Cardiac muscle cells appear striated or striped under a microscope.
What arrangement of cardiac muscle fibers makes the heart efficient?
Cards In This Set
| Front | Back |
|---|---|
| The heart is located between the lungs in an area known as what? | Mediastinum |
| What arrangement of cardiac muscle fibers makes a heart efficient? | Arranged spirally around the heart |
| What is the innermost layer of the heart wall called? | Endocardium |
What is a good description of cardiac muscle fibers?
Cardiac muscle is striated muscle that is present only in the heart. Cardiac muscle fibers have a single nucleus, are branched, and joined to one another by intercalated discs that contain gap junctions for depolarization between cells and desmosomes to hold the fibers together when the heart contracts.
What organelles are in a cardiac muscle cell?
Cardiac muscle cells also contain mitochondria, which many people call “the powerhouses of the cells.” These are organelles that convert oxygen and glucose into energy in the form of adenosine triphosphate (ATP).
What is characteristic of heart muscle fibers?
Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.
What are the 3 types of muscle fibers?
The 3 types of muscle tissue are cardiac, smooth, and skeletal. Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.
What are the histologic features of cardiac muscle?
The cardiac muscle fibers are shorter than the skeletal muscle fibers and show the branching pattern. These muscle fibers have one or two centrally placed nuclei. From the cardiac muscle histology slide, you might identify the following important histological features.
What are the characteristics of cardiac muscle fibers?
Cardiac muscle fibers are long cylindrical cells with one or two nuclei. The nuclei are centrally situated like that of smooth muscle. Cardiac muscle sarcoplasm has a great amount of mitochondria to meet the energy demands. Similar to the skeletal muscle, cardiac muscle cells have an invaginating network of T-tubules and sarcoplasmic reticulum.
How are the fibers of cardiac muscle separated?
The fibers are separated by collagenous tissue that supports the capillary network of cardiac tissue. The myofilaments of cardiac muscle are arranged in a similar pattern to skeletal muscle, resulting in cross-striations. The fibers are crossed by linear bands called intercalated discs.
Why are cardiac muscle cells striated?
Like skeletal muscle, cardiac muscle cells are striated due to a similar arrangement of contractile proteins. Unique to the cardiac muscle are a branching morphology and the presence of intercalated discs found between muscle fibers.