1. The Endocrine System
Why is the endocrine system important during the teen years?
The endocrine system is especially important during the teen years because one of its main functions is to regulate growth and development.

2. In this lesson, you will learn to:
Lesson Objectives
In this lesson, you will learn to:
Describe the glands of the endocrine system and the function of each
Examine the effects of health behaviors on the endocrine system

3. Structure of the Endocrine System
The endocrine system consists of a network of endocrine glands located throughout the body.
Hormones are secreted by the endocrine glands and then carried to their destinations in the body by the blood.
Hormones produced during puberty trigger physical changes in the body.

4. Structure of the Endocrine System
Some Glands of the Endocrine System
Thyroid gland
Parathyroid glands
Hypothalamus
Pineal Gland
Testes and Ovaries
Thymus Gland
Pancreas

5. Structure of the Endocrine System
Pituitary Gland
The pituitary gland is known as the master gland. It has three sections, or lobes—anterior, intermediate, and posterior.

6. Structure of the Endocrine System
Lobes of the Pituitary Gland
Anterior
Intermediate
Posterior
The anterior, or front, lobe of the pituitary gland produces six hormones.
These hormones include somatotropic, or growth, hormone, thyroid stimulating hormone, and adrenocorticotropic hormone.
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) control the growth, development, and functions of the gonads.

7. Structure of the Endocrine System
Adrenal Glands
The adrenal glands each have two parts.
Adrenal Cortex
Adrenal Medulla
The adrenal cortex secretes a hormone that inhibits the amount of sodium excreted in urine and serves to maintain blood volume and pressure.
It also secretes hormones that aid the metabolism of fats, proteins, and carbohydrates.

8. Problems of the Endocrine System
Serious Problems
Diabetes Mellitus
Graves’ Disease
Cushing’s Disease
Goiter
Growth Disorders

9. Problems of the Endocrine System
Diabetes Mellitus
Diabetes mellitus is a disorder in which the pancreas produces too little or no insulin, resulting in high blood glucose levels.
Symptoms include fatigue, weight loss, thirst, and frequent urination.

10. Problems of the Endocrine System
Graves’ Disease
Graves’ disease, also called hyperthyroidism, is a disorder in which an overactive and enlarged thyroid gland produces excessive amounts of thyroxine.
Symptoms include nervousness, weight loss, increased thirst, rapid heartbeat, and intolerance for heat.
Low thyroxine production, called hypothyroidism, causes fatigue, dry skin, weight gain, constipation, and sensitivity to cold.

11. Problems of the Endocrine System
Cushing’s Disease
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.

12. Problems of the Endocrine System
Goiter
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.

13. Problems of the Endocrine System
Growth Disorders
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.

14. Problems of the Endocrine System
Care of the Endocrine System
Eat nutritious meals, get enough sleep, and avoid stress.
Get medical tests done by health care professionals to determine whether your endocrine function is normal.

15. Q. The ovaries and testes are also known by the name _________.
Quick Review
Choose the appropriate option.
Q. The ovaries and testes are also known by the name _________.
gonads
pituitary gland
goiter
adrenal cortex

16. A. 1. gonads Quick Review - Answer
The ovaries and testes are also known by the name gonads.
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17. Quick Review
Choose the appropriate option.
Q. An endocrine gland is a ductless, or tubeless, organ or group of cells that secretes hormones directly into the bloodstream.
True
False

18. Quick Review - Answer
A. True. An endocrine gland is a ductless, or tubeless, organ or group of cells that secretes hormones directly into the bloodstream.
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19. Q. Which of the following are the two parts of the adrenal glands?
Quick Review
Q. Which of the following are the two parts of the adrenal glands?
norepinephrine cortex and the redilin medulla.
epinephrine membrane and the adrenaline membrane.
adrenal cortex and the adrenal medulla.
anociferin cortex and the graves membrane.

20. A. 3. adrenal cortex and the adrenal medulla.
Quick Review - Answer
A. 3. adrenal cortex and the adrenal medulla.
The two parts of the adrenal glands are adrenal cortex and the adrenal medulla.
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21. Quick Review
Choose the appropriate option.
Q. Many endocrine glands become more active during puberty, causing significant changes in adolescents, both male and female.
True
False

22. Quick Review - Answer
A. True. Many endocrine glands become more active during puberty, causing significant changes in adolescents, both male and female.
Click Next to attempt another question.

23. End of Lesson 1
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24. A. Correct! The ovaries and testes are also known by the name gonads.
Quick Review - Answer
A. Correct! The ovaries and testes are also known by the name gonads.
Click Next to attempt another question.

25. Quick Review - Answer
You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer.

26. Structure of the Endocrine System
Lobes of the Pituitary Gland
Anterior
Intermediate
Posterior
The intermediate, or middle, lobe of the pituitary secretes melanocyte-stimulating hormone (MSH), which controls the darkening of the skin by stimulating skin pigments.

27. Structure of the Endocrine System
Lobes of the Pituitary Gland
Anterior
Intermediate
Posterior
The posterior, or rear, lobe of the pituitary gland secretes antidiuretic hormone (ADH), which regulates the balance of water in the body.
ADH also produces oxytocin, which stimulates uterine contractions during the birth of a baby.

28. Structure of the Endocrine System
Lobes of the Pituitary Gland
Anterior
Intermediate
Posterior
The anterior, or front, lobe of the pituitary gland produces six hormones.
These hormones include somatotropic, or growth, hormone, thyroid stimulating hormone, and adrenocorticotropic hormone.
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) control the growth, development, and functions of the gonads.
A gonad is another name for the ovaries and testes.

29. Structure of the Endocrine System
The endocrine system consists of a network of endocrine glands located throughout the body.
Hormones are secreted by the endocrine glands and then carried to their destinations in the body by the blood.
Hormones produced during puberty trigger physical changes in the body.
An endocrine gland is a ductless, or tubeless, organ or groups of cells that secretes hormones directly into the bloodstream.

30. Structure of the Endocrine System
The endocrine system consists of a network of endocrine glands located throughout the body.
Hormones are secreted by the endocrine glands and then carried to their destinations in the body by the blood.
Hormones produced during puberty trigger physical changes in the body.
A hormone is a chemical substance that is produced in glands and helps regulate many of your body’s functions.

31. Structure of the Endocrine System
Pituitary Gland
The pituitary gland is known as the master gland. It has three sections, or lobes—anterior, intermediate, and posterior.
The pituitary gland regulates and controls the activities of all of the other endocrine glands.

32. Structure of the Endocrine System
Adrenal Glands
The adrenal glands each have two parts.
Adrenal Cortex
Adrenal Medulla
The adrenal gland is a gland that helps the body recover from stress and respond to emergencies.
The adrenal cortex secretes a hormone that inhibits the amount of sodium excreted in urine and serves to maintain blood volume and pressure.
It also secretes hormones that aid the metabolism of fats, proteins, and carbohydrates.

33. Structure of the Endocrine System
Adrenal Glands
The adrenal glands each have two parts.
Adrenal Cortex
Adrenal Medulla
The adrenal medulla is controlled by the hypothalamus and the autonomic nervous system.
It secretes the hormones epinephrine (also called adrenaline) and norepinephrine.

34. Structure of the Endocrine System
Adrenal Glands
The adrenal glands each have two parts.
Adrenal Cortex
Adrenal Medulla
The adrenal gland is a gland that helps the body recover from stress and respond to emergencies.
The adrenal medulla is controlled by the hypothalamus and the autonomic nervous system.
It secretes the hormones epinephrine (also called adrenaline) and norepinephrine.

35. Structure of the Endocrine System
Some Glands of the Endocrine System
Thyroid gland
Parathyroid glands
Hypothalamus
Pineal Gland
Testes and Ovaries
Thymus Gland
Pancreas
The thyroid gland produces hormones that regulate metabolism, body heat, and bone growth.

36. Structure of the Endocrine System
Some Glands of the Endocrine System
Thyroid gland
Parathyroid glands
Hypothalamus
Pineal Gland
Testes and Ovaries
Thymus Gland
Pancreas
The parathyroid gland produces a hormone that regulates the body’s calcium and phosphorous balance.

37. Structure of the Endocrine System
Some Glands of the Endocrine System
Thyroid gland
Parathyroid glands
Hypothalamus
Pineal Gland
Testes and Ovaries
Thymus Gland
Pancreas
The pancreas is a gland that serves two systems - the digestive and the endocrine systems.

38. Quick Review - Answer
A. Correct! An endocrine gland is a ductless, or tubeless, organ or group of cells that secretes hormones directly into the bloodstream.
Click Next to attempt another question.

39. Quick Review - Answer
You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer.

40. Quick Review - Answer
A. Correct! The two parts of the adrenal glands are: adrenal cortex and the adrenal medulla.
Click Next to attempt another question.

41. Quick Review - Answer
You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer.

42. A. Correct! Many endocrine glands become more active during puberty, causing significant changes in adolescents, both male and female.

43. Quick Review - Answer
You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer.