tissues

Topics: Muscle, Connective tissue, Heart Pages: 3 (542 words) Published: January 15, 2014
The 4 Basic Tissue Types in the Human Body
Tissues are groups of cells with a common structure (form) and function (job). There are four main tissues in the body – epithelium, muscle, connective tissue and nervous tissue. I. EPITHELIUM
Functions (jobs):
1) It protects us from the outside world – skin.
2) Absorbs – stomach and intestinal lining (gut)
3) Filters – the kidney
4) Secretes – forms glands
Characteristics (Traits):
1) Closely attached to each other forming a protective barrier. 2) Always has one free (apical) surface open to outside the body or inside (cavity) an internal organ. 3) Always had one fixed (basal) section attached to underlying connective tissue. 4) Has no blood vessels but can soak up nutrients from blood vessels in connective tissue underneath. 5) Can have lots of nerves in it (innervated).

6) Very good at regenerating (fixing itself). i.e. sunburn, skinned knee. Classifications (types):
1) By shape
a) squamous - flat and scale-like
b) cuboidal - as tall as they are wide
c) columnar - tall, column-shaped
2) By cell arrangement
a) simple epithelium - single layer of cells (usually for absorption and filtration) b) stratified epithelium - stacked up call layers (protection from abrasion (rubbing) - mouth, skin.)

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The 4 Basic Tissue Types in the Human Body

II. CONNECTIVE TISSUE
Functions (jobs):
1) Wraps around and cushions and protects organs
2) Stores nutrients
3) Internal support for organs
4) As tendon and ligaments protects joints and attached muscles to bone and each other 5) Runs through organ capsules and in deep layers of skin giving strength The 3 Elements of Connective Tissue:

1) Ground substance – gel around cells and fibers
2) Fibers – provide strength, elasticity and support
3) Cells

2 Kinds of Connective Tissue:
1) Loose Connective Tissue:
a) Areolar Connective Tissue – cushion around organs, loose arrangement of cells and fibers. b) Adipose Tissue – storehouse for...
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