Chapter 2. Tissues

Plant Tissues

* Tissues are a group of cells similar in structure and function.

* Plant tissues include meristematic and permanent tissues.
* Permanent tissues often form protective covering in the form of epidermis and cork.
* Permanent tissues are of two types: simple and complex.
* Simple tissues include parenchyma, collenchymas and sclerenchyma.
* Complex tissues include xylem and phloem.

Animal Tissues


* Animal tissues are epithelial, connective, muscular and nervous tissues.

* Epithelial tissues are squamous, columnar, cuboidal, ciliated and stratified tissues.
* Connective tissues are fluid, areolar, adipose, fibrous, cartilage and bone.
* Muscular tissues are striated, unstriated and cardiac tissues.
* Nervous tissue consists of neurons that transmit information throughout the body.

Tissues in Animals – I


* Animal tissues are epithelial, connective, muscular, and nervous tissues.

* The different types of epithelial tissues are squamous epithelium columnar epithelium, glandular epithelium, ciliated epithelium, cuoidal epithelium, stratified squamous epithelium.

Tissues in Animals – II


* Muscular tissues are striated, unstriated and cardiac tissues.

* Striated muscles are cylindrical, unbranched and multinucleated. They are found in our limbs, skin, face and neck.
* Unstriated mucles are spindle shaped muscles with one nucleus. They are found in the iris of the eye, urinary bladder, ureters and Bronchi of the lungs.
* Cardiac muscles are branched, cylindrical fires with a single nucleus. The contraction and relaxation of these Involuntary Muscles cause heart beats.
* Nervous tissues have elongated cells called neurons. Nervous tissues are found in the brain, spinal cord and nerves.
* Nervous tissues consist of neurons that transmit information throughout the body.

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