Cardiac muscles, Biology

Assignment Help:

CARDIAC MUSCLES -

  1. The cardiac muscles are found in the wall of the heart and in the wall of large veins (e.g., pulmonary veins and superior vena cava) where these veins enter the heart.
  2. These fibres show the characters of both unstriped and striped muscle fibres. Each fibre is a long and cylindrical structure which lacks a definite sarcolemma.
  3. The fibres are uninucleate and the nuclei lie near the centre.
  4. The fibres have some lateral branches, known as oblique bridges to form a contractile network.
  5. The myofibrils have transverse faint dark and light bands, which alternate with each other. In this way cardiac muscle fibres are also striped, but having dark intercalated discs at intervals.
  6. The intercalated discs are specialized regions of cell membrane of two adjacent fibres. The intercalated discs function as boosters of contraction wave and permit the wave of muscle contraction to be transmitted from one cardiac fibre to another.

656_cardiac muscles.png

UNIQUE FEATURES -

  1. Cardiac muscle fibres are supplied with both central and autonomic nervous system and are not under the control of the will of the animal.
  2. However, these muscles never get fatigued. Thus they are immune to fatigue.
  3. Blood capillaries penetrate the cardiac muscle fibres.
  4. They have very rich blood supply.
  5. They have the property of contraction, even when they are isolated from the body temporarily.

Related Discussions:- Cardiac muscles

Avian leukosis (sarcoma group of retroviruses), A v i a n leukosis (Sar...

A v i a n leukosis (Sarcoma group of retroviruses) This is a complex of viral diseases caused by an avian retrovirus with various manifestations such as lymphoid leukosis,

Unconventional oilseed cakes/meal, Unconventional oilseed cakes/meal ...

Unconventional oilseed cakes/meal Deoiled sal (Shorea robusta) seed meal: It is a byproduct obtained after the extraction of oil from sal seeds. It is found to be high in NF

Procedures for diagnosis - electron microscopy, Direct demonstration of the...

Direct demonstration of the causative agent by electron microscopy (EM): Where facilities for electron microscopy are available and a viral disease is suspected, presence o

Explain process of selection of taxonomic characters, Explain process of Se...

Explain process of Selection of taxonomic characters Selection of taxonomic characters Eventually classification systems may be based almost entirely on direct study of th

What is the role of heart in human body, What is the role of heart in human...

What is the role of heart in human body? The heart is the main pump that circulates the blood and fluid within the body. The heart, beats at 72 times per minute, and pumps abou

Supra vulvar aortic stenosis, Supra Vulvar Aortic Stenosis :  Supra v...

Supra Vulvar Aortic Stenosis :  Supra valvar aortic stenosis in children with elfin facies, mental retardation, multiple peripheral pulmonary artery stenosis and hyper calcem

Explain cis-trans isomers, Explain Cis-trans isomers Atoms or groups a...

Explain Cis-trans isomers Atoms or groups are called  cis or  trans to one another when they project respectively on the same or on opposite sides of a reference plane  identi

Classification of microorganisms, Q. Classification of microorganisms? ...

Q. Classification of microorganisms? The microorganisms use our food as a source of nutrients for their own growth. This, of course can result in deterioration of the food. By

Explain percutaneous interventions, Q. Explain Percutaneous Interventions ...

Q. Explain Percutaneous Interventions Over the last two decades, significant strides have been made in the field of Balloon Valvuloplasties both in terms of technique as well a

Theory of natural selection, What key idea, contained in Malthus's essay on...

What key idea, contained in Malthus's essay on populations, helped Darwin formulate his theory of natural selection?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd