What is the longitudinal channel in the bone called?

Which cells secrete fibers in connective tissue?

Refer to the given figure and identify the correct characteristic features.
$(i)$ It is a type of loose connective tissue.
$(ii)$ It contains fibroblasts,macrophages,collagen fibres,and mast cells.
$(iii)$ The cells of this tissue are specialized to store fats.
$(iv)$ It forms the inner lining of blood vessels,stomach,and intestine.

The main difference between white and yellow fibres is of:

Which part of the body's weight is formed by connective tissue (in $\%$)?

Describe the characteristics and types of connective tissue.