What is the main function of $WBC$?

Which parts of our body are composed of nervous tissue? Name the cells that make up the nervous tissue.

$(a)$ Name the animal tissue which is present in the larynx.
$(b)$ Write the chemical constituents of this tissue.
$(c)$ What functions does this tissue perform?

Differentiate the following activities on the basis of voluntary $(V)$ or involuntary $(IV)$ muscles:
$(a)$ Jumping of a frog
$(b)$ Pumping of the heart
$(c)$ Writing with hand
$(d)$ Movement of food in your intestine

Which of the following cells is found in the cartilaginous tissue of the body?

Write true $(T)$ or false $(F)$ for the following statements:
$(a)$ Epithelial tissue is a protective tissue in the animal body.
$(b)$ The lining of blood vessels,lung alveoli,and kidney tubules are all made up of epithelial tissue.
$(c)$ Epithelial cells have a lot of intercellular spaces.
$(d)$ The epithelial layer is a permeable layer.
$(e)$ The epithelial layer does not allow the regulation of materials between the body and the external environment.