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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

Anatomy of the Endocrine System The endocrine system is a complex network of glands and organs. It uses hormones to control and coordinate your body's metabolism, energy level, reproduction, growth and development, and response to injury, stress, and mood. The following are key

Chronic Respiratory Disorders Many chronic respiratory disorders require clinical care by a doctor or other health care professional. Listed in the directory below are some of the conditions, for which we have provided a brief overview. Tuberculosis Asthma Cystic Fibrosis Chronic

Anatomy of the Prostate Gland Facts about the prostate gland The prostate gland is about the size of a walnut. It's located just below the bladder, and it surrounds the urethra. This is a tube that carries urine and semen out of the body. The prostate is partly muscular and

Cystic Fibrosis Overview What is cystic fibrosis? Cystic fibrosis (CF) is an inherited disease of the glands that make mucus and sweat. People with CF get a defective gene from both parents. People who have one defective gene from one parent are called carriers. They don't have

Pollen and Children What is pollen? Each grain of pollen is tiny (microscopic). When there is a lot of pollen together, it becomes a fine yellow powder. It's made of the male reproductive cells of flowering plants, trees, grasses, and weeds. It's the most common cause of hay

Immune Disorders Many different immune disorders require clinical care by a physician or other health care professional. Listed in the directory below are some, for which we have provided a brief overview. All About the Immune System Immune Deficiencies Disorders of the Immune

Anatomy of Female Pelvic Area Endometrium. The lining of the uterus. Uterus. Also called the womb, the uterus is a hollow, pear-shaped organ located in a person's lower abdomen, between the bladder and the rectum. Ovaries. Two female reproductive organs located in the pelvis

Warning Signs During Pregnancy What are some warning signs of possible pregnancy complications? Talk with your healthcare provider about the possible warning signs of preterm labor and other pregnancy complications. Tell your healthcare provider right away if you have any of

Topic Index Planning a Pregnancy Prenatal Medical Care Pregnancy Common Discomforts of Pregnancy Common Tests During Pregnancy Risks to Pregnancy Warning Signs During Pregnancy Labor and Delivery Breastfeeding Your Baby Bottle-Feeding Click on the links above to learn more about