Tissues and Cell Structures

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Tissues are groupings of cells with similar functions. There are four main kinds of human tissues: Muscle Tissue
Muscular tissue is made up of cells that have sliding protein (actin, a globular protein, and myosin) filaments. As these filaments slide over each other, they cause the cell to contract. Cells are arranged in cables within cables, twined around each other, so that when a muscle contracts, it is actually millions of cells contracting synchronously. There are three types of muscle tissue; cardiac muscle that operates in the heart; skeletal muscle which is used for locomotion (among other functions) and is found all over the body; and smooth muscle which is found in a variety of organs (such as the stomach and bladder) and in blood vessels. Smooth muscle also causes our hair to stand on end.

Nervous Tissue
Nervous tissue makes up the brain and nervous system. It is used to transmit information around the body for a huge variety of tasks (for example, controlling muscles). Apart from in the brain, it is also found in the spine and in sensory organs such as the eyes. It is made up of cells called neurons which transmit electric-chemical signals around the body and centrally to the brain. For example, when we feel pain in our finger, it is caused by sensory input to the nerve cells in the finger, which transmit an electric impulse to the brain. The brain then “translates” this impulse into what we call pain.

Epithelial Tissue
Epithelial tissue, among other things,

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