Ch 49: Holt McDougal Modern Biology Chapter 50: Endocrine System

About This Chapter

The Endocrine System chapter of this Holt McDougal Modern Biology textbook companion course helps students learn essential modern biology lessons on the endocrine system. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Endocrine System textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Endocrine System chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the endocrine system topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Function of hormones
  • Male reproductive hormones secreted by the HPG axis
  • Hormones that control the ovarian cycle
  • Hormones secreted by the pituitary gland
  • Functions of the thyroid gland
  • Functions of the adrenal glands
  • Hormones of the testes and ovaries
  • Anatomy and functions of the pancreas
  • Functions of the thymus
  • Functions of the pineal gland
  • Roles of the parathyroid gland
  • Feedback systems for regulating growth, reproduction and homeostasis

Holt McDougal Modern Biology is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

12 Lessons in Chapter 49: Holt McDougal Modern Biology Chapter 50: Endocrine System
Test your knowledge with a 30-question chapter practice test
Hormones: Definition, Function & Intro to the Endocrine System

1. Hormones: Definition, Function & Intro to the Endocrine System

This lesson introduces the endocrine system and provides a brief overview of each endocrine gland. It also provides the definition of hormones and describes their general function inside the body.

The HPG Axis: Hormones of Male Reproduction

2. The HPG Axis: Hormones of Male Reproduction

Do you know how your body communicates? How does the brain get in touch with other parts of the body? In this lesson, you will learn about how the male's brain uses hormones to communicate to the testes as a way of regulating reproduction.

HPG Axis: Hormonal Control of the Ovarian Cycle

3. HPG Axis: Hormonal Control of the Ovarian Cycle

Everything in the female reproductive system is connected. See how the brain interacts with the ovaries during the female's ovarian cycle in this lesson covering the female HPG axis.

What Is the Pituitary Gland? - Functions, Hormones & Hypothalamus

4. What Is the Pituitary Gland? - Functions, Hormones & Hypothalamus

In this lesson, we'll discuss the functions of the anterior and posterior portions of the pituitary gland, the hormones they release and the relationship with the hypothalamus.

The Thyroid Gland: Functions, Calcitonin & TSH

5. The Thyroid Gland: Functions, Calcitonin & TSH

Your thyroid gland produces the hormones T3 and thyroxine (T4), which play a role in metabolism. Your thyroid also produces calcitonin, which helps regulate blood calcium levels. In this lesson, you will learn about the thyroid gland and its hormones, including how they are regulated by TSH.

Adrenal Glands: Function, Cortex & Medulla

6. Adrenal Glands: Function, Cortex & Medulla

The adrenal glands sit on top of your kidneys and are comprised of an inner medulla region that is enclosed by the outer adrenal cortex. Both portions of the adrenal gland secrete hormones that regulate body functions and help maintain internal balance.

Hormones of the Testes and Ovaries: Functions & Anatomical Features

7. Hormones of the Testes and Ovaries: Functions & Anatomical Features

The testes and the ovaries secrete steroid hormones that help you grow and develop. In this lesson, we will learn about the female hormones, estrogen and progesterone, and the male hormone, testosterone, and how these hormones influence the development of secondary sex characteristics.

Pancreas: Functions, Anatomy & Insulin Production

8. Pancreas: Functions, Anatomy & Insulin Production

The islets of Langerhans within your pancreas produce the hormones insulin and glucagon. In this lesson, you will learn how these hormones regulate your blood sugar level in opposite ways.

Pineal Gland, Functions, Melatonin & Circadian Rhythm

9. Pineal Gland, Functions, Melatonin & Circadian Rhythm

Deep inside your brain sits a very small endocrine gland called the pineal gland. This tiny gland secretes the hormone melatonin, and in this lesson, you will learn about the role melatonin plays in regulating sleep and wake cycles.

Parathyroid Gland: Calcium Metabolism, Osteoclasts & PTH

10. Parathyroid Gland: Calcium Metabolism, Osteoclasts & PTH

The parathyroid glands are tiny endocrine glands found on the posterior surface of the thyroid gland. In this lesson,, you will learn about the parathyroid glands, and the role parathyroid hormone plays in maintaining normal blood calcium levels.

Using Feedback Systems to Regulate Growth, Reproduction & Dynamic Homeostasis

11. Using Feedback Systems to Regulate Growth, Reproduction & Dynamic Homeostasis

In order to maintain specific internal conditions, organisms use feedback mechanisms. Feedback is essential to the regulation of internal environments, which allows for proper biological functioning.

Thymus: Definition, Functions & Location

12. Thymus: Definition, Functions & Location

The human immune system is responsible for protecting the body from foreign invaders as well as internal problems. In this lesson, you will learn about part of the immune system known as the thymus.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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