Unit 4: Cells, Tissues, Organs, and Systems

Viruses can make you feel awful! This article explains how feeling bad might be your immune system’s way of helping you heal.

Astronauts can experience bone loss in space. To understand why, you need to know a bit about how bones are formed and maintained in your body.

Using stethoscopes, doctors can use sound waves to detect various health issues. Learn how this device has evolved since it was invented in 1816!

Errors during meiosis can alter the number of chromosomes in cells and lead to genetic disorders.

Get your hands cold for science and explore the topic of sensory adaptation.

Many people believe that hookah smoking is safer than cigarette smoking. But in fact, hookah smoking can be even more harmful to your health!

Did you know that too much carbon dioxide in the classroom can affect your body, and even your grades?

Learn how e-cigarettes and other vaping products work, and why scientists and health professionals have concerns about their safety.

Make some fake snot and explore the function of mucus in this fun activity.

What is a reflex? Test your reaction time and find out why reflexes are important in this challenge activity.

Get active in this activity and explore the impact of exercise on your heart rate. Ready, set, GO!

Learn how to measure lung capacity and about the factors that can affect our lung capacity in this hands on activity.

Snake venom can be dangerous for your circulatory system, nervous system or muscular system. But it can also be very useful in medicine.

Be a biochemist! Learn how to extract DNA from an onion and find out what DNA looks like.

Explore the concept of persistence of vision in this hands on activity.