41-50 of 663 Results Found
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About the Heart and Blood Vessels The heart is the hardest working muscle in the human body. Located almost in the center of the chest, a healthy adult heart is the size of a clenched adult fist. By age 70, the human heart will beat more than 2.5 billion times. The heart is
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Preventing Eye Strain at the Computer If you spend hours each day working at a computer screen or other devices with screens, you may suffer from symptoms of eye strain. Eye strain is a common problem, but you can take steps to reduce your discomfort. What is eye strain? Eye
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Cystic Fibrosis and the Digestive System How does cystic fibrosis affect the digestive system? Children with cystic fibrosis (CF) have a protein in their cells that doesn't work right. The protein is called CFTR (the cystic fibrosis transmembrane regulator). CFTR controls the
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Talking to Your Child About Gun Violence at School A child’s safety is the top priority for every caregiver. The news of a school shooting can trigger strong feelings in both adults and children. Even if your child hasn’t heard about gun violence on the news or through people
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Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood
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Anatomy and Function of the Urinary System How does the urinary system work? The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The kidney and
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Anatomy of the Endocrine System in Children These are parts of the endocrine system: Hypothalamus. This gland is in the brain. It secretes hormones that stimulate or suppress the release of hormones in the pituitary gland. It also controls water balance, sleep, temperature
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The Risks of Drug Use in Pregnancy Drugs like cocaine and marijuana can cause a lot of harm to a pregnancy. Many people of childbearing age in the United States use some form of drugs. Risks to the pregnant person If you use drugs during pregnancy, you raise your risk for: Anemia
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How Were the COVID-19 Vaccines Made So Fast? Vaccines for COVID-19 are now widely available. In the past, it’s taken many years to create a vaccine that’s ready for public use. But over decades of creating vaccines, research groups and public health agencies have been making the
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Cold vs. Allergy in Children: How to Tell the Difference Colds are infections of the upper respiratory tract (sinuses, nasal passages, throat, and larynx). They are caused by several different viruses. They are spread by: Touching a person with a cold, such as shaking hands, and