Question

Which of the following is formed of neural tissue?
A. Spinal cord and brain
B. Kidneys
C. Gall bladder and abdomen
D. Esophagus and bronchi

Answer 1

Neural tissue is also known as nervous tissue is the main component of the nervous system. Neural tissues are composed of neurons which are composed of two parts – cell body and cell processes. The cell body is a round, star, or oval-shaped structure containing the nucleus and the various cell organelles. The cell process is composed of axons and dendrites.

Complete answer:
The kidney is a part of the excretory system. The structural and functional unit of the kidney is the nephron and the cuboidal epithelium makes up the lining of the kidney. Hence the option B. Kidney is incorrect.
The gall bladder and abdomen are parts of the digestive system. The gall bladder is made up of three layers of cells – the inner layer contains the epithelial cells and lamina propria is made up of loose connective tissue, a muscular layer that contains smooth muscles, and a perimuscular layer that contains the connective tissue for covering the muscular layer. The abdomen is composed of the digestive organ. No neurons are found here. Hence the option C. Gall bladder and abdomen is incorrect.
The esophagus is a part of the digestive system made up of stratified squamous epithelium that contains numerous mucus-secreting glands. Bronchi is the part of the respiratory system and is made up of pseudostratified epithelium and contains cilia, goblet, and basal cells and are lined by ciliated columnar cells. Hence the option D. Esophagus and bronchi are incorrect.
The spinal cord and brain are the parts of the nervous system and contain neurons as their structural and functional unit.

Hence option A. Spinal cord and brain are the correct answer.

Note:
The number of axons in a neuron is always one but the number of dendrons can be one or more than one, if a single process is seen in a neuron then it will be an axon. Neurons can be classified into three types – unipolar ( cell body with one axon, seen in the embryonic stage), bipolar neuron ( one axon and one Dendron in the cell body, seen in rod cells of the retina ), multipolar(one long axon and many short dendrons, seen in the cerebral cortex).