Mammary gland

High school (ages 12+)
Human Body

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/mammary-gland

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the type of gland?Modified apocrine sweat or sebaceous glands, functioning as exocrine organs
2. What is the evolutionary significance?A defining characteristic of mammals, enabling reliable offspring nutrition and parental care
3. What are mammary glands and why do they exist?Mammary glands are special organs that make milk to feed baby animals. They evolved so babies could get a safe, nutrient‑rich food source even when the outside world is harsh.
4. Why do some mammals have nipples while others don't?Monotremes, the most ancient mammals, have milk that comes out onto skin patches, so they don’t need nipples. Marsupials and placental mammals have nipples so their babies can suckle directly.

Synapomorphy: A shared derived characteristic that defines a taxonomic group, like mammary glands for mammals.
Galactopoiesis: The physiological process of maintaining milk production after lactation has begun.
Altricial young: Offspring that are born in a helpless condition and require extensive parental care.