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Epithelial- From one of the major types of Tissue
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- The covering or protective tissues in the animal body are epithelial tissues.
- Epithelium covers most organs and cavities within the body.
- The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.
- Different types of epithelial tissues as listed as under:
- Squamous: Simple squamous epithelial cells are extremely thin and flat and form a delicate lining.
- The esophagus and the lining of the mouth are also covered with squamous epithelium.
- Stratified Squamous: Stratified squamous epithelium is skin epithelial cells arranged in many layers to prevent wear and tear.
- Cuboidal: Cuboidal epithelium (with cube-shaped cells) forms the lining of kidney tubules and ducts of salivary glands, where it provides mechanical support.
- Columnar (Ciliated): Columnar epithelium where absorption and secretion occur, as in the inner lining of the intestine, tall epithelial cells.
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Connective- From one of the major types of Tissue :
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- The cells of connective tissue are loosely spaced and embedded in an intercellular matrix.
- The matrix may be jelly-like, fluid, dense or rigid.
- Blood is a type of connective tissue.
- Blood has a fluid (liquid) matrix called plasma, in which red blood corpuscles (RBCs), white blood corpuscles (WBCs) and platelets are suspended.
- The plasma contains proteins, salts and hormones.
- Blood flows and transports gasses, digested food, hormones and waste materials to different parts of the body.
- Bone is another example of a connective types of tissue.
- It forms the framework that supports the body.
- It also anchors the muscles and supports the main organs of the body.
- It is a strong and nonflexible tissue.
- Bone cells are composed of calcium and phosphorus compounds.
- Ligaments: Two bones can be connected to each other by another type of connective tissue called the Ligament.
- This tissue is very elastic.
- It has considerable strength.
- Tendons connect muscles to bones and are another connective types of tissue.
- Cartilage is a type of connective tissue, Cartilage smoothens bone surfaces at joints and is also present in the nose, ear, trachea and larynx.
- Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow.
- It fills the space inside the organs, supports internal organs and helps in repairing types of tissues.
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Muscular- From one of the major types of Tissue
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- Muscular tissue consists of elongated cells, also called muscle fibers.
- These types of tissues are responsible for movement in our body.
- Muscles contain special proteins called contractile proteins, which contract and relax to cause movement.
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Nervous- From one of the major types of Tissue
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- The brain, spinal cord and nerves are all composed of the nervous tissue.
- The cells of this type of tissue are called nerve cells or neurons.
- A neuron consists of a cell body with a nucleus and cytoplasm, from which long thin hair-like parts arise .
- Each neuron has a single long part (process), called the axon, and many short, branched parts (processes) called dendrites.
- An individual nerve cell may be up to a meter long.
- The signal that passes along the nerve fiber is called a nerve impulse.
The functional combination of nerve and muscle tissue is fundamental to most animals. This combination enables animals to move rapidly in response to stimuli.
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