In Frog heart, there are cardiac muscles which consist of fibres called :

Question

Accepted Answer

In the context of the frog heart, the correct answer is Option 1: Purkinje fibers. Here's a detailed explanation supporting this choice and why the other options are incorrect:

1. **Purkinje fibers**: These are specialized cardiac muscle fibers that play a crucial role in the conduction system of the heart. In frogs, as in other vertebrates, Purkinje fibers are responsible for conducting electrical impulses rapidly throughout the heart, ensuring coordinated contractions. This efficient conduction system is essential for maintaining the rhythmic heartbeat necessary for effective blood circulation. The presence of Purkinje fibers in the frog heart highlights their importance in the cardiac conduction system, making Option 1 the correct choice.

2. **Myonemes**: These are contractile elements found in certain protozoans and are not related to the cardiac muscle fibers in the frog heart. Myonemes are involved in the movement and contraction of these single-celled organisms, but they do not play a role in the conduction system of vertebrate hearts. Therefore, Option 2 is incorrect in the context of frog cardiac muscles.

3. **Telodendria**: This term refers to the terminal branches of an axon in a neuron, which are involved in transmitting nerve impulses to other neurons or muscle cells. While telodendria are crucial in the nervous system, they are not a component of cardiac muscle fibers in the frog heart. Thus, Option 3 is not applicable to the context of the question.

4. **Columnae carnae**: These are muscular ridges found on the inner walls of the ventricles in the human heart. They help in preventing the inversion of the heart valves during contraction. However, columnae carnae are specific to mammalian hearts and are not a feature of the frog heart. Therefore, Option 4 is incorrect when discussing the cardiac muscles of frogs.

In conclusion, Purkinje fibers are the correct answer as they are integral to the conduction system of the frog heart, ensuring efficient and coordinated heart contractions. The other options do not pertain to the cardiac muscle fibers in frogs, making them incorrect in this context.