HUMAN BODY PRESENTATION

study of tissues

let us learn about the tissues

1$intro

2$basicdefinition

index

3$parts of tissues

there are four types of basic tissues that are shown in image

1. connective tissue
2. epithelial tissue
3. nervous tissue
4. muscular tissue

tissue

tissues,group of cells and material surrounding them work together to perform specific functions for the body are called tissues.

• The human body is made of four general types of tissues.

– Epithelial tissues – for lining body cavities, covering internal organs and large surfaces.

– Connective tissues – for supporting and linking tissues or organs together; some are specialized to provide protection, to store fat, and even to provide circulatory function in the cardiovascular system.

– Muscle tissues – for providing contraction and relaxation in the body surfaces, in the heart chambers , and in hollow organs such as blood vessels and the digestive tract.

- Nerve tissue – for generating and transmitting electrical signals (nerve impulses ) in the brain, spinal cord, and nerves.

EPITHELIAL TISSUE

Epithelium

• 1. Covering of body surfaces and internal organs, and lining of body cavities. • 2. Major tissue component of glands. • 3. Always has a free surface (exposed to an open space) and a basement membrane (usually anchored to a connective tissue). • 4. Lacks blood vessels , so nourishment comes from the underlying connective tissue by diffusion movement. • 5. Other unique characteristics: • a. Reproduce rapidly. • b. Cells in epithelial tissues are often attached to one another by desmosomes which allow the tissue to serve as an excellent protective layer.

connective tissue

• Most abundant of the primary tissues by weight. • Function : 1) Binding and Support 2) Protection 3) Insulation 4) Transportation (blood) • origin : All C.T. arise from mesenchyme derived from embryonic mesoderm germ layer. • Have matrix : fills the space between cells. • Fibers ( 3 types). • ground substance (matrix): fills the space between cells. • cells

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nervous tissue

Tempor Labore

• found in the brain , spinal cord , and nerves.• consists of cells called neurons that aresensitive to changes (stimuli) in theenvironment and within the body , resulting ingenerating and transmitting nerve impulsesthrough their nerve fibers.• types of nerve fibers• axon – only 1 per neuron ; transmits impulsesaway from the cell.• Dendrite – thousands per neuron ; transmitsimpulses to the cell.

Tempor Labore

Tempor Labore

muscular tissue

Muscular tissue is a specialized tissue in animals which applies forces to different parts of the body by contraction. It is made up of thin and elongated cells called muscle fibers. It controls the movement of an organism. The cytoplasm in the muscle fibers is called sarcoplasm. It contains a network of membrane called the sarcoplasmic reticulum. The membrane surrounding the muscle fibers is called sarcolemma. properties of Muscular Tissue 1-Contractibility– It is the ability of muscle cells to shorten forcefully. 2-Extensibility– A muscle has the ability to be stretched. 3-Elasticity– The muscles have the ability to recoil back to its original length after being stretched. 4-Excitability– The muscle tissue responds to a stimulus delivered from a motor neuron or hormone.

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