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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).