AIDS, HIV and the Eye
The human immunodeficiency virus (HIV) is a virus that causes a breakdown of the body's immune system. Your immune system fights off illness and infection and is essential to maintaining a healthy body. Once HIV is present in the body, it attacks ... [... more]
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Exercising With Allergies and Asthma
Exercise is an important activity for everyone. Exercise will help people with asthma and other allergy problems. In general, a person with allergies or asthma is usually able to exercise. However, exercise should not be done during times of ... [... more]
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When Should I See an Allergist?
Asthma and other allergic diseases are two of the most common health problems. Approximately 50 million Americans have asthma, hay fever or other allergy-related conditions. Some allergy problems — such as a mild case of hay fever — may not need ... [... more]
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The Brain - Lobes
The cerebrum (the portion of your brain that performs motor and sensory functions and a variety of mental activities) is divided into four lobes - the frontal, temporal, parietal and occipital lobes. Some of these lobes are separated by deep ... [... more]
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The Brain - Side View
Your brain has three main components: the cerebrum (which consists of the left and right cerebral hemispheres), the cerebellum and the brain stem. The cerebral hemispheres of the brain make up the largest part of your brain. The cerebellum is the ... [... more]
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The Digestive System
Your digestive system consists of organs that break down food into components that your body uses for energy and for building and repairing cells and tissues. Food passes down the throat, down through a muscular tube called the esophagus, and ... [... more]
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The Muscle - Back View
Each of your muscles is made up of thousands of thin, long, cylindrical cells called muscle fibers. The muscle fibers' highly specialized structure enables the muscles to relax and contract to produce movement. Muscles vary greatly in their shape ... [... more]
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The Muscle — Front View
Each of your muscles is made up of thousands of thin, long, cylindrical cells called muscle fibers. The muscle fibers' highly specialized structure enables the muscles to relax and contract to produce movement. Muscles vary greatly in their shape ... [... more]
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The Nervous System
The brain and spinal cord comprise your central nervous system. The network of nerves that connect at different levels of the spinal cord control both conscious and unconscious activities. It is through the spinal cord that information flows from ... [... more]
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The Nervous System — Groups of Nerves
Your nervous system is composed of the central nervous system, the cranial nerves, and the peripheral nerves. The brain and spinal cord together form the central nervous system. The cranial nerves connect the brain to the head. The four groups of ... [... more]
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The Respiratory System — Structure Detail
The main muscle used for breathing; separates the chest cavity from the abdominal cavity. A flap of cartilage that prevents food from entering the trachea (or windpipe). The tube through which food passes from the mouth down into the ... [... more]
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The Skin
The skin — the largest organ of the body — is made up of a thin outer layer (called the epidermis) and a thicker outer layer (called the dermis). Below the dermis is the subcutaneous tissue, which contains fat. Buried in the skin are nerves that ... [... more]
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