A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
  • Antibody

    Antibody is a protein in the blood that defends against an invading foreign agent, such as a virus or bac ...

    Antibody is a protein in the blood that defends against an invading foreign agent, such as a virus or bacterium. The invading agent is called an antigen. Each antibody works against a specific antigen ...

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  • Antigen

    Antigen is an invading foreign agent, such as a virus or bacterium, that causes antibodies to form. (See ...

    Antigen is an invading foreign agent, such as a virus or bacterium, that causes antibodies to form. (See also antibody.) ...

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  • Antioxidants

    Antioxidants Natural substances that are made by the body. They  help to put oxygen in the cells of the h ...

    Antioxidants Natural substances that are made by the body. They  help to put oxygen in the cells of the human body, and many different foods are full of antioxidants. They may protect the cells in a p ...

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  • Aromatherapy

    Aromatherapy This approach to stress reduction refers to the use of volatile (like a vapor or gas) essest ...

    Aromatherapy This approach to stress reduction refers to the use of volatile (like a vapor or gas) essestial oils, and other scented plant compounds (or substances) to affect a person's mood or health ...

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  • Arrhythmia

    Arrhythmia is any disorder or abnormality of a person’s heart rate or heart rhythm, such as beating too f ...

    Arrhythmia is any disorder or abnormality of a person’s heart rate or heart rhythm, such as beating too fast (tachycardia), too slow (bradycardia), or irregularly. Normally, the 4 chambers of the hear ...

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  • Arteriosclerosis or Atherosclerosis

    Arteriosclerosis or Atherosclerosis is the buildup of fatty material in the arteries that hardens or calc ...

    Arteriosclerosis or Atherosclerosis is the buildup of fatty material in the arteries that hardens or calcifies. The buildup of plaque is known as atherosclerosis (ATH-er-o-skler-O-sis), and is more li ...

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  • Arthritis

    Arthritis Arthritis means inflammation of one or more joints in the body. There are more than 100 types o ...

    Arthritis Arthritis means inflammation of one or more joints in the body. There are more than 100 types of arthritis, and most forms are chronic (last a long time, or forever). There is no one cause o ...

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  • Asthma

    Asthma is an inflammatory disease of the lungs which is usually characterized by reversible airway obstru ...

    Asthma is an inflammatory disease of the lungs which is usually characterized by reversible airway obstruction. Attacks, which often include shortness of breath, wheezing and coughing, are stimulated ...

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  • Attenuated

    Attenuated means that a procedure has been used to weaken an agent of disease, such as a virus or bacteri ...

    Attenuated means that a procedure has been used to weaken an agent of disease, such as a virus or bacterium. A vaccine against a viral or bacterial disease can be made from an attenuated, or weakened, ...

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  • Autism

    Autism is a childhood developmental disorder that appears during the first 3 years of life, and affects t ...

    Autism is a childhood developmental disorder that appears during the first 3 years of life, and affects the brain's development of usual social and communication skills. Although the exact cause of au ...

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