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Human Biology 103: tissue types
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A group of cells of the same type that perform the same function are called tissues

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Connective tissues bind and support body parts

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Muscular tissues move parts of the body

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Nervous tissues conduct nerve impulses

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Epithelial tissue covers body surfaces and lines cavities

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Connective tissues have 3 main components: specialized cells, ground substances
(noncellular material between the cells) and protein fibers
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It is found under the skin and around some organs

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There are two main types of supportive connective tissue: cartilage and bone
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The matrix is made of collagen and calcium
salts
There are 2 types of bone tissue: compact and spongy
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Compact bone makes up the shafts of long bones
Consists of cylindrical structural units called osteons
The central canal contains blood vessels and nerves
Bone cells are located in lacunae

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Spongy bone is inside the ends of long bones
Lighter than compact bone but it is still strong
-There are two types of fluid connective tissues: blood and lymph

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Blood is a fluid matrix called plasma and cellular components called formed elements

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There are three types of formed elements
Red blood cells (erythrocytes) which are cells that carry oxygen
White blood cells (leukocytes) are cells that fight infections
Platelets (thrombocytes) are pieces of cells that clot blood

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Lymph is derived from fluid surrounding the tissues, contains white blood cells

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Lymphatic vessels absorb excess interstitial fluid and return lymph to the cardiovascular
system

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There are three types of muscle tissue: skeletal, smooth and cardiac

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Skeletal muscle tissue is attached to the skeleton by tendons, they contract to move the
skeleton and the muscle fibers are very long

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