Endocrine System

Thyroid and Parathyroid Glands

What are the functions of the thyroid hormones?

Thyroid hormones affect almost every cell in the body. Some important effects of thyroid hormones on various cells and organ systems are:

  • Increases body metabolism by increasing the rate at which cells use oxygen and food to produce energy

  • Causes the cardiovascular system to be more sensitive to sympathetic nervous activity

  • Increases heart rate and force of contraction of heart muscle

  • Maintains normal sensitivity of respiratory centers to changes in oxygen and carbon dioxide concentrations

  • Stimulates the formation of red blood cells to enhance oxygen delivery

  • Stimulates the activity of other endocrine tissues

  • Ensures proper skeletal development in children


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