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

Determine about the the halstead category test, Determine about the The Hal...

Determine about the The Halstead Category Test  This test is a concept identification procedure in which the subject must discover the method or principle that governs various

Functional difference between neurons and glial cells, Q. What are the func...

Q. What are the functional differences between neurons and glial cells? Neurons and Glial cells are the cells that form the nervous system. Neurons are cells that have the func

Explain states of matter, Q. Explain States of matter Ans. Chemistry de...

Q. Explain States of matter Ans. Chemistry deals with the nature and composition of matter - anything that occupies space and has mass, and the changes which it undergoes. Matt

Explain the autonomic neuropathy, Explain the Autonomic neuropathy It l...

Explain the Autonomic neuropathy It leads to dry skin due to decreased sweating. Dryness of the skin leads to cracking which makes entry of infection in to the deeper plane eas

What is the basic structure of a virus, What is the basic structure of a vi...

What is the basic structure of a virus? Viruses are constituted of genetic material (DNA or RNA) covered by a protein capsule also called as a capsid. Some viruses, like HIV, h

Amphibian circulation be classified as incomplete and double, Q. Why can th...

Q. Why can the amphibian circulation be classified as incomplete and double? The amphibian circulation is double because it is composed of pulmonary and systemic circulations r

Determine the term epitheliomuscular cell, Determine the term Epitheliomusc...

Determine the term Epitheliomuscular cell. Cells which line outer surface of cnidarians. These cell have two functions: first is to form the outer body covering of animal, seco

What are the different organs of the respiratory system, The different orga...

The different organs of the respiratory system  Nostrils through which we inhale air in the nasal cavity  Pharynx  Larynx  Trachea (wind pipe)  Lungs - Bronchi,

Paratyphoid and other salmonella infections, P a r a typhoid and other ...

P a r a typhoid and other Salmonella infections Paratyphoid salmonellae are non-host-specific. The commonly reported species are S. Typhimurium, S . Enteritidis S . T

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