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1_______. Cells respond to stimuli from the environment outside their walls. 2_______. Thus, for example, muscle cells stretch and contract, nerve cells carry signals, endocrine-gland cells manufacture hormones.
There are many different kinds of cells in the human body, but they can generally be classified as follows:
Epithelial cells, which are found in the skin, membranes, and glands. 3_______.
Connective tissue cells, found in bones, cartilage, ligaments, and tendons, make up the supporting tissues of the body.
Muscle cells, which have the power to expand and contract.
4_______.
Blood cells, red and white, found in the blood and the blood-forming organs (bone marrow).
Each cell is born (by the process of cell division), lives, feeds itself, grows, reproduces itself by division, dies
They also perform the special task
Their function is to protect surfaces
Nerve cells are found in the brain, spinal cord and all other nerves