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Note on Animal Tissue

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A group of animal cells with similar size, shape, and specific functions are called animal tissues. On the basis of their size, shape and function, they are divided into four major types. They are:

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

Muscular tissue

Muscular tissue contains many small, longitudinal and parallel contractile fibers called myofibrils. They may be uni-nucleated or multinucleated. On the basis of their positions and functions, they are of following types:

  • Skeletal muscle: The movement of the muscle is under the control of skeletal muscle. So, they are also called voluntary muscle.
  • Smooth muscle: Their movement is not under the control of ones will thus it is also called involuntary muscle. They have the unique power of rhythmic contraction.
  • Cardiac muscle: It has characteristics of both skeletal and smooth muscle. It contracts automatically and rhythmically.

Connective tissue

Connective tissue connects and provides support to the various organs of the body together. By the nature of the matrix, they are of three types. They are:

  • Connective tissue proper: It surrounds organs and tissues such as muscles, nerves, bones, kidney etc. It helps to strengthen the structure and helps to repair the tissue.
  • Skeletal connective tissue: It provides support for the body and forms the rigid framework for the attachment of the muscles.
  • Fluid connective tissue: It circulates in the body and is responsible for the transportation of materials from one place to another.

Nervous tissue

They perform the function of response and conduction of impulses. It consists of nerve cells and nerve fibers. The unit of the nervous system is called neuron.

A neuron consists of two parts: cell body and nerve fibers. The cell body is the round structure and has two types of nerves fibers generated from it. They are Dendron and Axon. The branch of dendron is called dendrites. Dendron carries impulses to the cell body whereas axon carries impulses from the cell body to dendrites.

  • A group of animal cells with similar size, shape, and specific functions are called animal tissues.
  • Muscular tissue contains many small, longitudinal and parallel contractile fibers called myofibrils.
  • Cell body is round structure and has two types of nerves fibers generated from it. They are Dendron and Axon.
  • The unit of the nervous system is called neuron.

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Very Short Questions

The function of a ligament is to join together giving slight movement to them where as the function of lymphocytes is to collect waste materials of the body.

The main function of nervous tissue (neuron) is to perform the response and conduction of the impulses. The differences between axon and Dendron are as follows:

Axon Dendron
a) They are long and unbranched. a) They are short and branched.
b) They transmit the impulses away from the cell body. b) They receive the impulses from other neurons and conduct to the cell body.

a) Secret hormones, sweat and saliva.
Glandular epithelium tissue found in human body.

b) Transport sensation
Nervous tissue found in human body.

c) Transport food from the leaf to various parts of the plant.
Phloem tissue found in the plant body.

d) Protect the body and absorb fats.
Epithelial tissue found in human body.

Lactiferous tissue produces the milky juice called latex whereas glandular tissue produces oil, resin etc.

Lactiferous tissues Glandular tissues
a) They are thin walled, elongated and branched ducts. a) They are isolated cells or small group of cells.
b) They are internal. They may be internal or external.

A group of animal cells with similar size, shape and specific functions are called animal tissues. They are of four types:
i) Epithelial tissue
ii) Muscular tissue
iii) Connective tissue
iv) Nervous tissue

The contraction and relaxation of those tissues, which causes the movement of different parts of the body is called muscular tissue. They are of three types.
i) Skeletal muscular tissues
ii) Smooth muscle
iii) Cardiac muscular tissues

Skeletal muscular tissue Smooth muscular tissue
i) They are attached to the skeleton. i) They are attached to delicate organs like stomach, intestine.
ii) They are voluntary muscle. ii) They are involuntary muscle.

Cardiac muscles are combined form of skeletal and smooth muscles because they have dark and light bands as in skeletal muscles and they are involuntary in nature as smooth muscles.

Voluntary muscles Involuntary muscles
i) Their movement is under the control of one's will. i) Their movement is not under the control of one's will.
ii) They are found in legs, arms, hands, shoulders etc. ii) They are found in the intestine, ureter, urinary bladder etc.

The supporting fabric of the organs and other parts of the body is connective tissue. On the basis of matrix, they are of three types:
i) Soft connective tissues
ii) Hard connective tissues
iii) Liquid connective tissues

Any four functions of connective tissues are:
i) To form a protective covering around the organs.
ii) To connect the other tissues together. E.g. muscles and skin.
iii) To replace tissues which have been destroyed by injury.
iv) To form a supporting framework.

The differences between soft connective tissues and liquid connective tissues are as follows:

Soft connective tissues Liquid connective tissues
i) It is composed of fibrous and adipose tissue. i) This is composed of blood and lymph.
ii) It contains gelatinous matrix. ii) It contains liquid matrix.
iii) It helps to repair the tissues. iii) It helps in transportation of materials.

The differences are given below:

Cartilage Bone
i) It is weak and flexible. i) It is strong and non-flexible.
ii) It grows internally. ii) It grows internally or externally.
iii) It is without blood supply. iii) It has its blood supply.
Tendon Ligaments
i) It contains non-elastic white fiber. i) It contains elastic yellow fiber.
ii) It joins muscle to bone. ii) It joins bones together and gives slight movement to them.

Blood and lymph are the liquid connective tissues found in human body.

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  • Which are the four types of animal tissues?

    Connective, Muscular, Epithilial, Nervous
    Epithelial, Squamous, Muscular, Connective
    Cuboidal, Ciliated, Glandular, Columnar
    Epithelial, connective, Muscular, Cardiac
  • Which type of tissue forms glands?

    Epithelial
    Connective
    Muscle
    Nervous
  • A cell body which contains a nucleus and cytoplasm is ______

    tissue
    neuron
    tendon
    blood
  • Which of the following  prevents loss of water and protects from mechanical injury?

    Cubical epithelium


    Glandular epithelium


    Stratified epithelium


    Columnar epithelium


  • Which of the following consists of nerve cells and nerve fibers?

    Epithelial tissue


    Nervous tissue


    Muscular tissue


    Connective tissue


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