Definition of Thyroid hormones
|
|
Thyroid hormones: Chemical substances made by the thyroid gland, which is located in the front of the neck. This gland uses iodine to make thyroid hormones, which are essential for the function of every cell in the body. They help regulate growth and the rate of chemical reactions (metabolism), and are involved in the circadian rhythms that govern sleep, among other essential functions.
The two most important thyroid hormones are thyroxine (T4) and triiodothyronine (T3). Thyroid stimulating hormone (TSH), which is produced by the pituitary gland, acts to stimulate hormone production by the thyroid gland. The pituitary gland is stimulated to make TSH by the hypothalamus gland in the brain.
The thyroid also makes the hormone calcitonin, which is involved in calcium metabolization and stimulating bone cells to add calcium to bone. See calcitonin, thyroxine, triiodothyronine.
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=5780
Last Editorial Review: 3/26/1998 2:29:00 PM
Medical Dictionary Definitions A - Z
ENABLEX is a prescription medicine used in adults to treat the following symptoms due to a condition called overactive bladder:
- · having a strong need to go to the bathroom right away (also called "urgency")
- · leaks or wetting accidents (also called "urinary incontinence")
- · having to go to the bathroom too often (also called "urinary frequency")
IMPORTANT SAFETY INFORMATION
You should not take once-daily ENABLEX if you have certain types of stomach problems, glaucoma, or have trouble emptying your bladder. Side effects of ENABLEX include blurred vision, and more commonly dry mouth, constipation, indigestion, and abdominal pain. Use caution when doing certain activities until you know how ENABLEX affects you.
Women's Health
Find out what women really need.
From WebMD
Women's Conditions Resources
- Best Ways to Reduce Cellulite
- Mineral Makeup: Get the Facts
- Photos: Turn Your Bath Into a Spa Retreat
Featured Centers
- Top 10 Asthma Cities
- Health Check: How to Choose The Right Vitamins
- 10 Triggers for the Holiday Blues
Health Solutions From Our Sponsors
Most Popular Topics
Explore 80+ Centers
- Allergy
- Allergy Medications
- Anaphylaxis
- Antidepressants
- Anxiety
- Arthritis
- Asthma
- Baby's Health
- Back, Neck, Head Injury
- Bioterrorism, Warfare
- Blood, Lymphatic System
- Bone, Joint, Muscle
- Brain, Nervous System
- Breathing Difficulties
- Burns
- Camping
- Cancer, Tumors
- Children's Health
- Cholesterol
- Cold and Flu
- CPR, Choking
- Cuts, Scrapes, Bruises
- Dementia
- Depression
- Diabetes
- Diabetic Coma, Insulin Shock
- Digestive System
- Dislocations
- Drowning
- Drug Overdose
- Ear, Nose, Throat
- Emotional Wellness
- Endocrine System
- Environmental Injuries
- Erectile Dysfunction
- Exercise, Nutrition
- Eye, Vision
- Fainting
- Fever
- First Aid, Emergency
- First Aid Kits
- Food Poisoning
- Foreign Bodies
- Fractures, Broken Bones
- Glaucoma
- Headache
- Health, Medical
- Heartburn, GERD, Reflux
- Heart, Blood Vessels
- Heart Attack
- Hepatitis
- Immune System
- Incontinence
- Infections
- Kidneys, Urinary System
- Lung, Airway
- Medications
- Men's Health
- Mental Health, Behavior
- Multiple Sclerosis
- Nosebleeds
- Osteoporosis
- Outdoor Living
- Overexposure
- Poisoning
- Procedures
- Psoriasis
- Public Health
- Scuba Diving, Swimming
- Seizures
- Senior Health
- Shock
- Skin, Hair, Nails
- Sleep Disorders
- Social, Family Health
- Sports Injury
- Sprains, Strains
- Statins
- STDs
- Substance Abuse
- Teen Health
- Teeth, Mouth, Oral Health
- Weight Management
- Wilderness Emergencies
- Women's Health
- Wounds
