Human Anatomy and Physiology

Explore the intricate structures and functions of the human body, from cells to organ systems.

Cells: The Building Blocks of LifeTissues and Organs: Teamwork in ActionThe Major Body Systems
The Nervous System: Communication HeadquartersThe Circulatory System: Keeping You PumpedThe Immune System: Your Body's Defense Force
First Aid: Helping the Body HealHealthy Habits for a Strong BodyUnderstanding Medical Tests
Making Diagrams and Mind MapsUsing Mnemonics and Stories
Cells: The Building ...Tissues and Organs: ...The Major Body Syste...The Nervous System: ...The Circulatory Syst...The Immune System: Y...First Aid: Helping t...Healthy Habits for a...Understanding Medica...Making Diagrams and ...Using Mnemonics and ...
Advanced Topics

The Circulatory System: Keeping You Pumped

What Does the Circulatory System Do?

Your circulatory system is like a delivery service, moving blood, oxygen, and nutrients to every part of your body.

The Heart: Your Body's Engine

The heart is a muscular pump that beats about 100,000 times per day! It pushes blood through a network of blood vessels.

Blood Vessels: The Highways

  • Arteries: Carry blood away from the heart.
  • Veins: Bring blood back to the heart.
  • Capillaries: Tiny vessels where oxygen and nutrients are exchanged.

How Does It All Work?

Oxygen-rich blood leaves your heart, travels through arteries, delivers oxygen to your body, and returns through veins. This keeps you energized and healthy.

Why Is This System Important?

If the heart stops, cells don't get oxygen, and life cannot continue. That's why CPR (cardiopulmonary resuscitation) is so important in emergencies!

Examples

  • Feeling your pulse is feeling your heart pumping blood.

  • When you get a cut, blood vessels help form a clot to stop bleeding.

In a Nutshell

The circulatory system delivers what your cells need and takes away waste, keeping you alive and active.

Next
The Immune System: Your Body's Defense Force