Biology

Learn how your respiratory system brings oxygen into the body and expels carbon dioxide through the process of breathing.

Discover what cells are, why they are the basic building blocks of all living things, and how animal and plant cells differ.

Discover how the heart pumps blood around the body and how the circulatory system delivers oxygen and nutrients to every cell.

Follow the journey of food through the digestive system and learn how nutrients are broken down and absorbed into the body.

Learn about the three types of muscle tissue and how muscles work with the skeleton to produce movement.

Learn how the nervous system detects stimuli, sends electrical signals, and coordinates responses throughout the body.

Find out about the essential nutrients the body needs, what foods provide them, and why a balanced diet is important for health.

Learn how plants use sunlight, water, and carbon dioxide to make their own food through photosynthesis.

Find out how all living cells release energy from glucose through the process of cellular respiration.

Explore the structure and functions of the human skeleton, the 206 bones that support, protect, and move your body.