Question

give brief account of types of cell found in connective tissue



correct answers

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Answer 1

Answer:

The common cell types in connective tissue include fibroblasts, mast cells,plasma cells,macrophages, adipocytes,and leukocytes.Fibroblasts are the most common cell type of connective tissue. They produce both fibers and amorphous ground substance.

Answer 2

$\sf\purple{Types \: of \: Connective \: Tissue}$

Connective tissues are divided into three groups:

Loose Connective Tissue

Loose connective tissues are present all over the body, where support and elasticity both are needed. Blood vessels, nerves and muscles, all have a loose connective tissue wrapping. They form the subcutaneous layer under the skin along with adipose tissues, attaching muscles and other structures to the skin.

• Areolar Tissue: It is present under the skin and supports epithelium. It contains randomly distributed fibres, fibroblasts, mast cells and macrophages. It supports the organs present in the abdominal cavity, fills the space between muscle fibres and wraps around blood and lymph vessels.

• Adipose Tissue: They are present under the skin and store fat. It acts as a shock absorber and helps in maintaining body temperature in colder environments.

• White adipose tissues protect kidneys and are also found at the back of the eye, in the hump of camels, blubber of whales, etc.

• Reticular Connective Tissue: It is made up of reticular fibres. It supports the internal framework of organs such as liver, lymph nodes and spleen.

Dense Connective Tissue

In the dense connective tissue, fibroblast cells and fibres are compactly packed. Their main function is to support and transmit mechanical forces. They are somewhat less flexible than loose connective tissue. On the basis of the arrangement of collagen fibres, they are divided into two types:

• Tendons and Ligaments: Tendons attach bones to skeletal muscles. Ligaments attach two bones together.

• Dense irregular tissue: There are many fibres including collagen, which are oriented irregularly or randomly. The irregular arrangement gives uniform strength in all directions. Fibres may form a mesh-like network. This type of tissue is present in the dermis of the skin.

Specialised Connective Tissue

Other than these, there are supportive connective tissues, that help in maintaining correct posture and support internal organs, e.g. cartilage and bone.

• Cartilage: Cartilage is mostly present in the embryonic stages and works as a supporting skeleton. Most of the cartilage is replaced by bones in adults, however, it supports some structures in adults too. In humans, cartilage is present between the bones of the vertebral column, in the external ear, nose and hands.

• Bones: Bone is the hardest connective tissue and helps in maintaining the shape and posture of the body, it protects internal organs. They are rich in collagen fibres and calcium, which give strength.

The cells of the bone are known as osteocytes. They are present in lacunae and secrete the matrix. There is substantial blood supply in bony tissues. The cytoplasmic extension of osteocytes makes tiny channels known as canaliculi. These channels help in communication among osteocytes and capillaries.

• Blood: Blood is made up of various cells present in the plasma. The blood contains red blood cells (RBCs), white blood cells (WBCs) and platelets.

1. RBCs have haemoglobin and transport oxygen.
2. WBCs form a defence system and protect from foreign antigens.
3. Platelets are important for blood clotting.
4. Plasma contains proteins, water, hormones, salts, etc. to transport to different parts of the body.

• Lymph: Lymph drains into the blood and transports absorbed fat to the blood, which cannot enter the bloodstream directly. Lymph has white blood cells in the liquid matrix. They help in getting rid of toxins and waste materials. They contain WBCs, which help in fighting infection.

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