How Many Layers of Skin Do We Have?

Are you looking for an easy way to teach your child about the human body? We’ve put together a set of free materials that parents and teachers can use right away. In this lesson, your child will dive into the fascinating world of the skin.

We’ll explore the three main layers of skin and their protective functions. Explore science in a more engaging way with captivating 3D videos and interactive quizzes. Download our app to get started!

What You Will Learn From This Lesson

What Does Each Skin Layer Do?

Did you know the skin is actually the largest organ of the human body? This organ is not just a thin covering; it is a vital organ with many functions. If you look closely, you’ll see the skin has three layers. These layers are the epidermis, dermis, and subcutaneous tissue. Each layer protects us in its own unique way.

The outermost layer of the skin is called the epidermis. The cells in the epidermis are tightly packed, which helps block out a lot of dust and bacteria. This layer also helps by firmly holding onto the body’s water and nutrients, preventing them from escaping.

The skin’s middle layer is called the dermis. This layer contains sweat glands, which produce all of our sweat. Sweat flows to the surface of the skin, carrying away heat and keeping the body cool. The dermis also contains nerve cells. These nerve cells act as alarms, sensing cold, heat, and pain. If the body touches something too hot, the nerves will send a warning to the brain so the body can take action.

The skin’s innermost layer is the subcutaneous tissue. This layer is full of fat cells. When an external impact happens, the fat cells reduce the force of impact, protecting the human body. Additionally, fat cells can keep our bodies warm by preventing heat loss.

How Do Hair and Nails Protect Us?

In addition to the skin’s three layers, other structures also provide protection. Hair grows from a hair follicle all the way out of the skin’s surface. Head hair protects the skin from the sun and helps keep the head warm. Tiny, soft vellus hairs on our limbs act like hangers, holding sweat so it dries faster. Other hairs, like eyebrows, can block sweat from entering the eyes. Eyelashes act as curtains by keeping out dust or small insects.

We also have hard nails. They protect the soft skin underneath. Nails protect fingers and toes from getting injured. Together, the skin, hair, and nails act like our armor, constantly protecting us.

Fun Fact

• Your skin is the largest organ of your entire body.
• The skin’s top layer, the epidermis, acts like body armor to block dust and germs.
• Sweat glands cool you down, like your body’s built-in air conditioner.
• The deepest layer is full of fat cells that act like a soft blanket for protection and warmth.
• Nerves in your skin are like tiny alarms that warn your brain about pain, heat, or cold.

Vocabulary

• Skin: The largest organ of the human body that protects us.
• Epidermis: The outermost layer of the skin, where cells are tightly packed to block dust and bacteria.
• Dermis: The middle layer of the skin, containing sweat glands and nerves.
• Subcutaneous Tissue: The innermost layer of the skin that is full of fat cells.
• Sweat Glands: Structures in the dermis that produce sweat to help cool the body.
• Nerve Cells: Cells in the dermis that allow the skin to sense cold, heat, and pain.
• Fat Cells: Cells in the subcutaneous tissue that reduce the force of external impacts and help keep the body warm.