Which is the best characteristic of cardiac muscles?

Cardiac muscle is characterized by striped muscle fibers, connected together by intercalated disks, where the membranes are specialized to allow electrical signals to pass easily. Like smooth muscles, cardiac muscles can remain in contraction for a sustained period.

What are the four properties of cardiac muscle?

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

Property # 4. Conductivity (Dromotropism):
  • SA Node: …
  • Internodal Tracts: …
  • AV Node: …
  • Bundle of His: …
  • Purkinje Fibers/Ventricular Myocardium:

Which are characteristics of cardiac muscle quizlet?

  • Small cells with single nucleus.
  • Striated.
  • Involuntary.
  • Intercalated discs- allows for gaps in between cells to deliver messages.
  • Automaticity- has the ability to contract without neural stimulation.
  • Pacemaker cells- set the pace for cardiac muscle cell contraction.

What was one unique characteristic about cardiac muscle?

The unique characteristic of cardiac muscle is the presence of intercalated discs found between muscle fibers so the cells are not fused. The intercalated disc allows the muscle cells to lock them together tightly and allow the quick passage of electrochemical signals between cells.

What are 2 special features of cardiac muscle?

The heart consists mostly of cardiac muscle cells (or myocardium). The outstanding characteristics of the action of the heart are its contractility, which is the basis for its pumping action, and the rhythmicity of the contraction.

What is cardiac muscle and its function?

Cardiac muscle is an involuntary striated muscle tissue found only in the heart and is responsible for the ability of the heart to pump blood.

Is cardiac muscle smooth?

Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control. Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

What is the structure of cardiac muscles?

Cardiac Muscle Structure

Cardiac muscle cells contain T tubules that connect to the sarcoplasmic reticulum which stores the calcium ions needed for the contraction of the cell. The myocardium is a thin, yet strong membrane that surrounds and protects the heart and its associated structures.

Which of the following is true about cardiac muscle tissue?

The correct answer is (c) cells are connected to one another by intercalated discs. In cardiac muscle tissue, the cells are connected to one another by intercalated discs.

What are the properties of cardiac cycle?

The cardiac cycle involves four major stages of activity: 1) “Isovolumic relaxation”, 2) Inflow, 3) “Isovolumic contraction”, 4) “Ejection”.

What are mechanical properties of cardiac muscle?

A muscle cell (cardiac or skeletal) contains smaller units called myofibrils, which in turn are made up of sarcomeres. The sarcomere contains overlapping thin and thick filaments, which are re- sponsible for the force de- velopment in the muscle cells. Thick filaments are made up of the protein myosin.

What are the electrical properties of cardiac muscle?

During extracellular stimulation, the electrical properties of the cardiac muscle cell membrane were investigated by means of intracellular microelectrodes. The current-voltage characteristic was S-shaped, and showed non-linearity over given voltage ranges in hyperpolarizing and depolarizing directions as well.

Which of the following is unique to cardiac muscle cells?

Unique to the cardiac muscle are a branching morphology and the presence of intercalated discs found between muscle fibers. The intercalated discs stain darkly and are oriented at right angles to the muscle fibers. They are often seen as zigzagging bands cutting across the muscle fibers.

Which part of the cardiac muscle protects the cell?

The outer layer, known as the epicardium or visceral pericardium, surround the cardiac muscle on the exterior. This helps protect it from contact with other organs.

What are the 7 phases of the cardiac cycle?

The different phases of the cardiac cycle involve:
  • Atrial diastole.
  • Atrial systole.
  • Isovolumic contraction.
  • Ventricular ejection.
  • Isovolumic relaxation.
  • Ventricular filling.

What is the shape of cardiac muscle?

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

Is the cardiac muscle voluntary or involuntary?

Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.

Why are cardiac muscles striated?

Skeletal and cardiac muscles are known as striated muscles, because the filaments of actin and myosin that power their contraction are organized into repeating arrays, called sarcomeres, that have a striated microscopic appearance.

What are the 5 characteristics of muscle tissue?

Terms in this set (5)
  • Excitability- can be stimulated by chemical signals, nerves and stretch.
  • Conductivity- the signal for a muscle to contract is spread from the point of stimulation throughout the entire muscle.
  • Contractility- ability of the muscle to shorten.
  • Extensibility- …
  • Elasticity-

Are cardiac muscles Multinucleated?

Therefore, cardiac muscle is functionally multinucleated and skeletal (voluntary) muscle are true multinucleated. So, the correct option is ‘Cardiac muscle’.

Is cardiac muscle Uninucleate or Multinucleated?

Cardiac muscle: It is a contractile tissue present in the heart. The muscle fibres are cylindrical, branched and uninucleate.