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Ch 34: Hormones & Mechanisms of Hormone Action for the MCAT: Help and Review

About This Chapter

The Hormones chapter of this MCAT Prep Help and Review course is the simplest way to master the mechanisms of hormone action. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of hormones for the MCAT.

Who's it for?

Anyone who needs help learning or mastering MCAT material will benefit from taking this course. There is no faster or easier way to prepare for the MCAT. Among those who would benefit are:

  • Students who have fallen behind in understanding endocrine system components and the hormones they produce
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about hormones and the mechanisms of hormone action for the MCAT
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the Hormones and Mechanisms of Hormone Action chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Hormones and Mechanisms of Hormone Action chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any question about hormones and the mechanisms of hormone action. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in a hormones unit of a standard science course. Topics covered include:

  • Hormone function in the endocrine system
  • Hormones produced by the pituitary gland
  • Functions of the thyroid and parathyroid glands
  • Structure and function of the adrenal glands
  • Epinephrine, norepinephrine and stress adaptation
  • Glucocorticoids, androgens and aldosterone
  • Melatonin and pineal gland functions
  • Insulin production in the pancreas
  • Hormones of the testes and ovaries
  • Estrogen, progesterone and hCG
  • Mechanisms of hormone action

18 Lessons in Chapter 34: Hormones & Mechanisms of Hormone Action for the MCAT: Help and Review
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.

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

2. 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.

Hormones of the Anterior Pituitary Gland: Names & Functions

3. Hormones of the Anterior Pituitary Gland: Names & Functions

The anterior pituitary gland secretes six hormones. In this lesson, you will learn the functions of the hormones: growth hormone (GH), prolactin (PRL), follicle-stimulating hormone (FSH), luteinizing hormone (LH), adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH).

The Thyroid Gland: Functions, Calcitonin & TSH

4. 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.

Parathyroid Gland: Calcium Metabolism, Osteoclasts & PTH

5. 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.

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.

Adrenal Glands: Epinephrine, Norepinephrine & Stress Adaptation

7. Adrenal Glands: Epinephrine, Norepinephrine & Stress Adaptation

The adrenal medulla is the central portion of the adrenal gland. In this lesson, you will learn about the two hormones secreted by the adrenal medulla - epinephrine and norepinephrine - and how they help you deal with short-term stressors.

Adrenal Cortex: Glucocorticoids and Androgens

8. Adrenal Cortex: Glucocorticoids and Androgens

The adrenal cortex secretes steroid hormones. In this lesson, you will learn about two of these steroid hormones: glucocorticoids, which help you deal with long-term stress, and androgens, which influence male sexual characteristics.

Adrenal Cortex: Aldosterone and Body Fluid Balance

9. Adrenal Cortex: Aldosterone and Body Fluid Balance

Mineralocorticoids are a type of steroid hormone secreted by the adrenal cortex. In this lesson, you will learn about the main mineralocorticoid, aldosterone, and how it regulates your body's salt and water balance.

Pineal Gland, Functions, Melatonin & Circadian Rhythm

10. 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.

Pancreas: Functions, Anatomy & Insulin Production

11. 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.

Hormones of the Testes and Ovaries: Functions & Anatomical Features

12. 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.

Hormones of the Placenta: Estrogen, Progesterone & hCG

13. Hormones of the Placenta: Estrogen, Progesterone & hCG

The placenta is an endocrine gland that is only present during pregnancy. In this lesson, you will learn about the hormones it produces, including human chorionic gonadotropin (hCG), progesterone, estrogen, and human placental lactogen (hPL).

What Is Norepinephrine? - Effects, Function & Definition

14. What Is Norepinephrine? - Effects, Function & Definition

Norepinephrine is a neurotransmitter that is secreted in response to stress. Learn about what norepinephrine is and how it affects the body. Additionally, discover what drug contains norepinephrine and if it is safe to use.

What is Antidiuretic Hormone? - Definition & Function

15. What is Antidiuretic Hormone? - Definition & Function

Although you may have never heard of antidiuretic hormone, it plays an important role in water retention, thirst and blood pressure. This lesson explains the function of the hormone and what can happen if it is not properly regulated.

What is Cortisol? - Definition, Function & Deficiency Symptoms

16. What is Cortisol? - Definition, Function & Deficiency Symptoms

In this lesson, learn about one of the most important hormones in the body: cortisol. This lesson defines cortisol, how it's made, and its function. Learn about cortisol deficiency, excess cortisol, and the effect it has on homeostasis and regulation in the body.

Hormonal Changes in Men: Puberty Through Maturity

17. Hormonal Changes in Men: Puberty Through Maturity

The changes that the male body undergoes during puberty are complex and largely driven by hormones. Through this lesson, you will explore the role that various hormones play in the physical and behavioral changes that occur from puberty to maturity.

The Mechanisms of Hormone Action

18. The Mechanisms of Hormone Action

To keep everything regulated, your body constantly needs to send messages to different cells. It does this by using hormones. In this lesson we'll look at how hormones work and what they do.

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Other Chapters

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