Glencoe Health 2005.pdf

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W O R D P R O C E S S I N G Use the bullet feature of your word-processing program to make your list. For help with word-processing software, go to Lesson 1 The Endocrine System 467 Graves’ disease, also called hyperthyroidism, is a disorder in which an overactive and enlarged thyroid gland produces excessive amounts of thyroxine. Symptoms include nervous- ness, weight loss, increased thirst, rapid heartbeat, and intoler- ance for heat. Low thyroxine production, called hypothyroidism, causes fatigue, dry skin, weight gain, constipation, and sensitivity to cold. Cushing’s disease results from the overproduction of adrenal hormones. Symptoms include round face, humped upper back, thin and easily bruised skin, and fragile bones. Goiter, an enlargement of the thyroid gland, is caused mainly by a lack of iodine in the diet. Since the introduction of iodized salt, goiters have become rare in the United States. Growth disorders are caused by abnormal amounts of growth hormone. With early diagnosis and proper treatment, a child with a growth disorder can reach a normal height. Care of the Endocrine System To keep your endocrine system functioning at peak performance, take care of all of your body systems. Eat nutritious meals, get enough sleep, and avoid stress. A health care professional can per- form medical tests to determine whether your endocrine function is normal. Staying physically active is one way of reducing stress and keeping your endocrine system healthy. What other healthful behaviors help ensure the health of this system? HS_HEALTH_U05_C18_L1 12/8/03 12:34 PM Page 467
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The Male Reproductive System YOU’LL LEARN TO Describe the parts of the male reproductive system and explain the function of each part. Relate the importance of early detection and warning signs that prompt males of all ages to seek health care for the male reproductive system. Identify situations requiring professional health services for preventive care. Analyze the importance and benefits of abstinence as it relates to the prevention of STDs. n essential function of all living things is reproduction, the pro- A cess by which life continues from one generation to the next. In humans, as in many other animal species, reproduction results from the union of two specialized sex cells—one from the male and one from the female. These cells are made by the the system of organs involved in producing offspring. Structure and Function of the Male Reproductive System he male reproductive system includes both external and T internal organs. The two main functions of the male repro- ductive system are the production and storage of the male reproductive cells, and the transfer of sperm to the female’s body during sexual intercourse. During the early teen years, usually between the ages of 12 and 15, the male reproductive system sperm system reproductive Why is it important to protect your reproductive system?
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