Explain animal tissue in short and …

On the basis of the structure of cells and their function, animal tissues are classified into four major types:

1. Epithelial Tissue
2. Muscular Tissue
3. Nervous Tissue
4. Connective Tissue

Epithelial Tissue:

• The covering or protective tissues in the animal body are animal tissues.
• The cells of this tissue are tightly packed and it forms continuous sheet. Indeed cells of epithelium contain very little or no intercellular matrix.
• The skin and lining of buccal cavity, blood vessels, alveoli of lungs and kidney tubules are made of epithelial tissue.
• Epithelial cells lie on a delicate non-cellular basement membrane which contains a special form of matrix protein, called collagen.

Muscular tissue:

• Muscular tissue constitutes all the muscles of the body of an animal.
• Muscle cells are elongated and large sized, so they are called muscle fibres.
• Muscle cells are typically arranged in parallel arrangement allowing them to work together effectively.
• This tissue is responsible for movement in our body. Muscles contain special proteins called contractile proteins, which contract and relax to cause movement.
• On the basis of their location, structure and function, there are following three types of muscle fibers:
  1. Striated muscles (stripped, skeletal or voluntary muscles)
  2. Smooth muscles (unstriated, visceral or involuntary muscles)
  3. Cardiac muscles

Nervous tissue:

• A tissue which is specialized to transmit messages in our body is nervous tissue. Brain, spinal cord and nerves are all composed of nervous tissue.
• Nervous tissue contains highly specialized unit cells called nerve cells or neurons.
• These cells are specialized for the conduction of impulse over great distance at great speed.
• A neuron consists of a cell body (cyton or soma) with a nucleus and cytoplasm, from which long thin hair- like parts arise called dendrons.
• Dendrons further branched out to form dendrites. From the distal part of cyton arises a very long process called axon.