Many cells lose their ability to function, or they begin to function abnormally.Īs aging continues, waste products build up in tissue. Among other changes, there is an increase in pigments and fatty substances inside the cell (lipids). They become larger and are less able to divide and multiply. The brain, spinal cord, and peripheral nerves are made of nerve tissue.Ĭells are the basic building blocks of tissues.
Nerve tissue is made up of nerve cells (neurons) and is used to carry messages to and from various parts of the body. Cardiac muscle, which makes up most of the heart wall (also an involuntary muscle).Smooth muscles (also called involuntary muscle), such as the muscles contained in the stomach and other internal organs like the female uterus.Striated muscles, such as those that move the skeleton (also called voluntary muscle).Muscle tissue includes three types of tissue:
WHEN SPECIALIZED CELLS JOIN TOGETHER IN A GROUP THEY FORM SKIN
The skin and the linings of the passages inside the body, such as the gastrointestinal system, are made of epithelial tissue. This includes bone, blood, and lymph tissues, as well as the tissues that give support and structure to the skin and internal organs.Įpithelial tissue provides a covering for superficial and deeper body layers. The different kinds of tissues group together to form organs.Ĭonnective tissue supports other tissues and binds them together. Tissues are layers of similar cells that perform a specific function. There are many different types of cells, but all have the same basic structure. Aging changes occur in all of the body's cells, tissues, and organs, and these changes affect the functioning of all body systems. All vital organs begin to lose some function as you age.
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