Question

the two principal types of cells found in nervous tissues are
neuroglial cells and neurons.
neurons and mast cells.
neuroglial cells and myofibers.
neurons and dendritic cells.

Explanation:

To determine the two principal cell types in nervous tissue, we recall the basic knowledge of nervous system anatomy. Nervous tissue is composed of two main types of cells: neuroglial cells (also known as glial cells) which support and protect neurons, and neurons which are the functional units that transmit electrical signals.

• The option "neurons and mast cells" is incorrect because mast cells are part of the immune system and not a principal cell type of nervous tissue.
• The option "neuroglial cells and myofibers" is incorrect as myofibers are muscle cells, not related to nervous tissue.
• The option "neurons and dendritic cells" is incorrect because dendritic cells are immune cells involved in antigen presentation.
• The correct option is "neuroglial cells and neurons" as these are the two main cell types in nervous tissue.

Answer:

A. neuroglial cells and neurons. (assuming the first option is labeled A, but based on the content, the correct choice is the one with neuroglial cells and neurons)