Question

Which signalling system would used by nerve cells? O paracrine signaling O endocrine signaling Ocell junction synaptic signaling cell-cell recognition

Answer 1

1. The signalling system used by the nerve cell is-

(a) The Paracrine signaling is used for cell to cell communication not by the nerve cells. So this option is incorrect.

(b) Endocrine signaling is use for sending signal to the distant cell not by the nerve cells. So this option is incorrect.

(c) Cell junction is a meeting or joining point between two cell. So this option is incorrect.

(d) Synaptic signaling is the signalling of two nerve cell in a synapse point. So this option is correct.

(e) Cell-cell recognition is the communication between two neighboring cell by membrane recognition proteins. So this option is incorrect.

So the correct answer is- Synaptic signaling.

2. The life on earth increases in complexity because the evolution and the natural selection pressure drives the life increase in complexity .

System increase in order is not a true phenomena because still new lower order species are appearing on this earth. So this option is incorrect.

The energy transfer system is efficient on most of the species including the lower order species. So this option is incorrect.

Constant increase in the energy output is the resultant of cellular complexity and energy requirement. So this option is also incorrect.

So the correct answer is- None of these