Question

In frog heart, there are cardiac muscles which consist of fibers called
a. Purkinje Fibers
b. Myonemes
c. Telodendria
d. Columnae carneae

Answer 1

There are unit 3 forms of the fibers of the self-excitatory and conducting muscle of the guts and that they are a unit named as nodal fibers, shift fibers, and physiologist fibers.

Complete answer:

Option A is correct.
Purkinje fibers are a part of the specialized conductivity network of the guts that ensures the wave of excitation spreads speedily and nearly synchronously to the cavum muscle mass. Purkinje fibers or Purkinje fibers or Purkinje cardiomyocytes square measure a neighborhood of the whole complicated of the viscous conductivity system, that's lately classified as specific muscle responsible for the generation of the guts impulses.

Option B is inaccurate.
A myoneme that is additionally referred to as spasmoneme, could be a contracted structure found in some being noncellular organisms, specifically ciliated protozoan. It contains a series of supermolecule filaments that shorten speedily upon exposure to Ca. The myonemes of Acantharia additionally show slow contraction and wave movements.

Option C is inaccurate.
Any of the terminal or smaller branches of associate axone that dismisses with specific ending that releases neurochemical. Initially, telodendria seek advice from the terminal branches of dendrites, currently they seek advice from the most or terminal arborization of associate axone.

Option D is inaccurate.
Columnae carneae that are additionally referred to as trabeculae carneae are unit rounded or irregular muscular columns that project from the inner surface of the proper and ventricle of the guts. These area units are completely different from the rough muscles, that area unit gift within the atria of the guts.

Hence, the correct answer is option (A).

Note: The guts wall of frog consists of visceral pericardium, myocardium, and serous membrane. The cardiac muscle consists of branched and striated nonetheless involuntary viscus muscles that contract and relax rhythmically at a hard and fast rate.