Homeostasis
1. Homeostasis is defined as the body's internal environment being within a certain physiological state. There are seven major factors that need to be homeostaticly maintained. They are: concentration of oxygen and carbon dioxide, nutrition of cells, concentration of wastes, concentration of sugars, salts, and other electrolytes, temperature, and volume and pressure. An example of the body maintaining homeostasis is blood pressure. When the hear begins to pump faster, it sends more blood into the arteries which increases blood pressure. Pressure sensitive nerve cells detect the higher pressure and respond by sending the brain nerve impulses. The brain then sends impulses to the heart and certain blood vessels to slow the heart rate. If any of the seven factors and not correctly maintained, illness or death may occur.2. Tissues are groups of cells and i
Epithelial, connective, muscle, and nervous tissue. Stratified epithelium consists of two or more layers and is used for protection of underlying tissues. Epithelial tissue can also be classified by layers of cells. Pseudostratified columnar epithelium tissue looks multilayered, but is actually only a single layer. They can change shape du to stretching or movement of body parts. ntercellular substances that function together to perform specialized activities. Hair on the head provides the scalp with protection from ultra violet rays. There are four basic shapes of connective tissue cells. Cuboidal cells are thicker and can be described as cubed or hexagonal shape. The skin provides protection for underlying tissues against physical abrasion, dehydration, ultra violet rays, and bacteria. Both shape and arrangement of layers of cells can classify epithelial tissues. For example, eyelashes and eyebrows protect the eyes from dust and other foreign particles. Connective tissue is also the most abundant tissue in the body for these reasons. Squamous cells are flat and connect to each other like tiles. Hair also helps to provide protection.
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