What are the histological characteristics of cardiac muscle cells?

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.

What are the structural characteristics of cardiac muscle cells?

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 is cardiac muscle and what are some characteristics?

Cardiac muscle is highly organized and contains many types of cell, including fibroblasts, smooth muscle cells, and cardiomyocytes. Cardiac muscle only exists in the heart. It contains cardiac muscle cells, which perform highly coordinated actions that keep the heart pumping and blood circulating throughout the body.

What are the 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.

Where is cardiac muscle found histology?

the heart wall

Cardiac muscle is striated, involuntary muscle found in the heart wall.

What characteristics differentiates cardiac muscle cells from skeletal muscle cells?

Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker.

Which of the following are characteristics of cardiac muscle quizlet?

HISTOLOGY: Cardiac Muscle Tissue

  • Single nucleus per cell.
  • Branched (intercalated disks)
  • Cross striations (sarcomeres)
  • Rhythmic contractions to pump blood.
  • Involuntary movement.

What are the four properties of cardiac muscle?

The physiological properties of the cardiac muscle are: 1. Rhythmicity 2. Excitability 3. Contractility 4.

  • SA Node: …
  • Internodal Tracts: …
  • AV Node: …
  • Bundle of His: …
  • Purkinje Fibers/Ventricular Myocardium:

What are the four characteristics of muscles?

All muscle tissues have 4 characteristics in common:

  • excitability.
  • contractility.
  • extensibility – they can be stretched.
  • elasticity – they return to normal length after stretching.

How do you identify cardiac muscle tissue?

Cardiac muscle is only found in the heart. Its fibers are longer than they are wide, and they are striated, like skeletal muscle fibers. But, unlike skeletal muscle fibers, cardiac muscle fibers have distinct ends to them, called intercalated discs. These are dark lines that run from one side of the fiber to the other.

What are histological features?

Highlights. Histology is the microscopic study of tissues and cells used in understanding the pathogenesis and diagnosis of various diseases. Cells are the tiny living units that form the tissues, organs and structures within the body.

Why are cardiac muscle cells branched?

The branched nature of cells and gap junctions allows rapid propagation of action potentials across the entire myocardium; this enables the heart to contract and relax as a single unit (functional syncytium). Unlike the skeletal muscle, the cardiac muscle is controlled by the autonomic nervous system.

What is the histology of the heart?

Histologically, the heart is mainly composed of cardiomyocytes and connective tissue. Dense connective tissue with elastic fibers is present in the cardiac/fibrous skeleton. Certain stains such as the Masson’s elastic trichrome stains can help visualize these components.

What are the histologic layers of the heart?

Histologically, the heart is made of three layers of tissue: epicardium, myocardium, and endocardium.

What is the function of epicardium?

The epicardium is a mesothelial cell layer which contributes to the coronary vessels and myocardium and acts as an important source of trophic signals to maintain continued growth and differentiation of the developing heart.

What is the histology of skeletal muscle?

Skeletal muscle cells are elongated or tubular. They have multiple nuclei and these nuclei are located on the periphery of the cell. Skeletal muscle is striated. That is, it has an alternating pattern of light and darks bands that will be described later.

Which is a histological type of muscle in the body?

Histologically, cardiac muscle appears striated like the skeletal muscle due to arrangement of contractile proteins. It also has several unique structural characteristics: The fibers of cardiac muscle are not arranged in a simple parallel fashion.

How do you identify histology smooth muscle?

Smooth muscle is made up of cells that contain a single central nucleus. The cells stick together and are connected by specialised cell junctions, called gap junctions. The cells are spindle shaped, and the nucleus is central. This diagram shows a few of the cells that can be seen in the stained section below.

What is the shape of a cardiac muscle cell?


The cardiac muscle cell is rectangular in shape. The contraction of cardiac muscle is involuntary, strong, and rhythmical.

What are the 3 types of muscles and their characteristics?

The three main types of muscle include:

  • Skeletal muscle – the specialised tissue that is attached to bones and allows movement. …
  • Smooth muscle – located in various internal structures including the digestive tract, uterus and blood vessels such as arteries. …
  • Cardiac muscle – the muscle specific to the heart.

Is epicardium the same as visceral pericardium?

The word “pericardium” means around the heart. The outer layer of the pericardium is called the parietal pericardium. The inner part of the pericardium that closely envelops the heart is, as stated, the epicardium; it is also called the visceral pericardium.

What are the characteristics of smooth muscle?

Smooth muscle is typically non-striated, uni-nucleated, and involuntary or reflexive. This muscle type is slow twitch and often rhythmic in contraction.

Which of these are characteristics of smooth muscle cells quizlet?

Smooth muscle cells possess striations. Smooth muscle cells contain many nuclei. Smooth muscle cells contain a network of T tubules. Smooth muscle cells lack myofibrils and sarcomeres.

Which of the following is not a characteristic of smooth muscle cells?

Smooth muscles are found in limbs is not the characteristic of smooth muscles. Explanation: Smooth muscles are found in limbs is not the characteristic of smooth muscles. Active or skeleton muscles are located in the limbs, whereas involuntarily muscles are located in the lungs.

Which of the following are characteristics of smooth muscle quizlet?

HISTOLOGY: Smooth Muscle tissue

  • Single nucleus per cell.
  • No branches.
  • No cross striations (no sarcomeres)
  • Slow, rhythmic, prolonged contractions of visceral organs.
  • Involuntary movement.

What characteristic is seen in cardiac muscle but not in smooth muscle?

Muscle Types: 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 structures connect cardiac muscle cells together?

Intercalated discs are small connections that join cardiac muscle cells (cardiomyocytes) to each other.