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Tissues – “The Teams of Workers”

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notes

Tissue:

A group of cells that are specialized to perform a particular function forms a tissue.

Tissues are mainly classified into two types:
1. Plant Tissues
2. Animal Tissues

  • Cells form groups cells that need to perform a single task often group together.
  • This grouping of cells together to perform a function efficiently is called a Tissue.
  • For Example, Muscles and Blood.
  • The tissue cells have the same structure and they perform the same function.

Tissues of Plants and Animals:

Plant Tissues

Animal Tissues

plants do not move so their tissues are predominantly the ones that provide support to them so that they can stand erect.

Animals need more energy as compared to plants because they are not stationary. Their tissues are the ones that can support movement.

These tissues are made up of dead cells because dead cells can also provide mechanical strength to the plants and do not require much maintenance.

The tissues in case of animals are made up of living cells so that they can move and perform several functions.

Only certain parts of the plant can grow. The tissues present in such regions of and divide themselves and form new tissues.

Cells in animals grow uniform early and not only in certain regions of the body.

The structure of plant tissues is not very specialized as compared to animals

The organs and organ systems in animals are highly developed.

definition

Tissue: The tissue is a group of cells having similar origin, structure & function.

notes

Tissue:

The tissue is a group of cells having similar origin, structure & function.

So it is pretty clear that tissues are present in multicellular organisms. Different types of tissues come together to perform different functions. Let us discuss about plant and animal tissues.

  1. Plant tissue

  • Meristems

  • Permanent

    • Simple permanent tissue

    • Complex permanent tissue

      • Xylem

      • Phloem

  1. Animal tissue

  • Epithelial tissue

    • Squamous epithelium

    • Cuboidal epithelium

    • Columnar epithelium

    • Glandular epithelium

  • Connective tissue

    • Blood

    • Bone

    • Cartilage

    • Areolar Connective Tissue

    • Adipose Connective Tissue

  • Muscle tissue

    • Striated muscles/skeletal muscles/voluntary muscles

    • Unstriated muscles /smooth muscles/involuntary muscles

    • Cardiac Muscles

  • Nervous tissue

Example

What is tissue?

A tissue, in biology, is defined as a group of cells that possess a similar structure and perform a specific function. The word tissue originates from French, which means "to weave."

Example

What is the utility of tissues in multi-cellular organisms?

In unicellular organisms, a single cell performs all the basic functions such as respiration, movement, excretion, digestion, etc. But in multicellular organisms, cells are grouped to form tissues. These tissues are specialised to carry out a particular function at a definite place in the body. For example, the muscle cells form muscular tissues which helps in movement, nerve cells form the nervous tissue which helps in transmission of messages. This is known as division of labour in multicellular organisms. It is because of this division of labour that multicellular organisms are able to perform all functions efficiently.

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