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Body Systems

Different parts of your body work together to support your health every day. These articles explain what those parts do, how they work together, and what’s happening as your body goes about its normal functions.

Why Does Your Stomach Need Acid?

Why Does Your Stomach Need Acid?

What Happens to Food After You Eat It?

What Happens to Food After You Eat It?

What Does Oxygen Saturation Measure?

What Does Oxygen Saturation Measure?

What Do Blood Pressure Numbers Mean?

What Do Blood Pressure Numbers Mean?

Why Does Your Body Burn Calories at Rest?

Why Does Your Body Burn Calories at Rest?

Why Does Your Body React Before You Think?

Why Does Your Body React Before You Think?

How Does Your Body Control Things You Don’t Think About?

How Does Your Body Control Things You Don’t Think About?

What Happens in Your Body When You Breathe?

What Happens in Your Body When You Breathe?

How Do Your Eyes Turn Light Into What You See?

How Do Your Eyes Turn Light Into What You See?

How Do Your Ears Turn Sound Into What You Hear?

How Do Your Ears Turn Sound Into What You Hear?

How Does Your Sense of Smell Work?

How Does Your Sense of Smell Work?

How Does Your Sense of Taste Work?

How Does Your Sense of Taste Work?

How Does Your Body Sense Touch?

How Does Your Body Sense Touch?

What Gives Skin, Hair, and Eyes Their Color?

What Gives Skin, Hair, and Eyes Their Color?

How Does Your Body Keep Its Temperature Steady?

How Does Your Body Keep Its Temperature Steady?