Some days you look in the mirror and find a long dark hair where it didn't use to be. Maybe you're going through puberty, pregnancy, or menopause. Maybe you're not. But either way, that hair didn't appear out of nowhere. It just went...

Your hair isn't just something you have to deal with every morning, it's a part of who you are, and there are things it can tell you about your personal health. Hosted by: Hank Green

Alice Dreger works with people at the edge of anatomy, such as conjoined twins and intersexed people. In her observation, it's often a fuzzy line between male and female, among other anatomical distinctions. Which brings up a huge...

In high school biology, we learn that humans are born with either XX or XY chromosomes, and that a person’s internal and external sex organs match those chromosomes. It turns out, however, that sex isn’t that straightforward.

Do you think animals can be divided into two biological sexes: female and male? Well, it's way more complicated that that!_

Your hair isn't just something you have to deal with every morning, it's a part of who you are, and there are things it can tell you about your personal health. Chapters DANDRUFF 0:52 2 GENERAL HAIR LOSS 4:11 PATCHY HAIR LOSS 4:29...

Explore the endocrine system with the Amoeba Sisters! This video briefly discusses endocrine vs exocrine before showing major endocrine glands and discussing examples of hormones released by each gland. Video also provides an example of...

In this video, Jonathan from the Institute of Human Anatomy discusses where testosterone is produced, what the normal levels are, and who might be candidates for testosterone replacement therapy (TRT).

In this video, we examine the conversion of cholesterol to all of the major steroid classes: progestogens, mineralocorticoids, glucocorticoids, androgens, and estrogens.

In this video, we explore the functions of the major gonadotropins, FSH and LH, and how they are released.

In this video, we discuss the following:<br/>
[1] the layers of the adrenal glands and their<br/> secretions
[2] basics of the contr<br/>ol of these secretions
[3<br/>] histology of the adrenal glands

This video discusses the important functions of testosterone, including its role in promoting the development of masculine characteristics, bone growth, muscle mass, and red blood cell production. It also explores where testosterone is...

Lesson on Polycystic Ovarian Syndrome (PCOS), what it is, symptoms of PCOS, causes of PCOS, associated diseases and treatments for PCOS.

We've already learned about hormones in the context of the endocrine system, but now let's get a closer look at how these influence the development of sexual characteristics as well as sexual behavior. How and when does this happen? How...