Question

Areolar connective tissue joins
A. Fat body with muscles
B. Integument with muscles
C. Bones with muscles
D. Bones with bones

Answer 1

The main function of ligament is joining of bones to bones.
The matrix of connective tissue contains cells like mast cells, macrophages, reticular cells, etc. and fibres like collagen and elastin fibres.
The main function of the tendon is joining of muscles to bones.

Complete answer: In order to solve this question, we need to know about the types of connective tissue.
The connective tissues are the most abundant and widely distributed tissues in the body. Their main function is binding of other tissues in the organ.
There are three types of connective tissue- loose connective tissue, dense connective tissue and specialised connective tissues.
The loose connective tissue has cells and fibres which are loosely arranged in the matrix. These tissues are of 2 types- areolar tissue and adipose tissue.
The areolar tissue is found under the epithelium of skin, visceral organs like blood vessels, stomach, etc. It contains white collagen fibres (made up of collagen) and yellow elastic fibres (made up of elastin). The areolar tissue also contains macrophages and mast cells.
The main function of areolar tissue is protection of various organs from injuries. It also provides rapid diffusion of materials.
The adipose tissue is a modified areolar tissue. It contains white and yellow fibres in the matrix. It also contains fibrocytes and macrophages. They are found in subcutaneous regions around the heart, kidneys, etc.
The cells of adipose tissue are specialised for storage of fats. It forms a shock absorbing cushion around the organs.
The dense connective tissue has cells and fibres which are compactly arranged in the matrix. These tissues are of 2 types – dense regular connective tissue and dense irregular connective tissue.

In dense regular connective tissue, the cells and fibres are arranged in a specific manner in the matrix. These tissues consist of tendons and ligaments. Tendons are the white fibrous connective tissue that joins skeletal muscles to the bones. On the other hand, ligaments are the yellow elastic fibres that join bones to bones.
In dense irregular connective tissue, cells and fibres are randomly arranged in the matrix. These tissues are present in the skin.

So, the correct answer is option B, integument with muscles.

Note: The adipose tissues are also found in hump of camel, fat bodies of frog and yellow bone marrow.
The mast cells secrete histamine, heparin and serotonin.