Haversian canals of long bones contain:

How does blood differ from typical connective tissue?

What do mast cells secrete during an injury?

Read the following statements and answer the question.
$(i)$ They have a hard and non-pliable ground substance rich in calcium salts and collagen fibres.
$(ii)$ They support and protect softer tissues and organs.
$(iii)$ Osteocytes are present in the spaces called lacunae.
$(iv)$ They also interact with skeletal muscles attached to them to bring about movements.
Which of the following type of tissue is being described by above statements?

The main difference between white and yellow fibres is of:

Identify the given connective tissues in the figure.