The circulatory system (cardiovascular system) pumps blood from the heart to the lungs to get oxygen. The heart then sends oxygenated blood through
arteries to the rest of the body.

The endocrine system is a complex network of glands and organs in the human body that produce and secrete hormones. These hormones are chemical messengers that travel through the bloodstream to various target tissues or organs, where they regulate and control many physiological processes.

The urinary system (or urinary tract) works as your body’s filtration system. When your urinary system removes toxins and wastes from your body, it comes out as pee (urine).

Your digestive system is a network of organs that help you digest and absorb nutrition from your food. It includes your gastrointestinal (GI) tract and your

biliary system. Your GI tract is a series of hollow organs that are all connected to each other, leading from your mouth to your anus.

The reproductive system, also known as the genital system or the reproductive organs, is responsible for the production, transportation, and fertilization of gametes (reproductive cells) and the development and nurturing of offspring. 

Your integumentary system is your body’s outer layer. It’s made up of your skin, nails, hair and the glands and nerves on your skin. Your integumentary

system acts as a physical barrier (protecting your body from bacteria, infection, injury and sunlight).

Muscles are soft tissues. Many stretchy fibers make up your muscles. You have more than 600 muscles in your body. Different types of muscles have different jobs. Some muscles help you run, jump or perform delicate tasks like threading a needle.

The nervous system is a complex network of specialized cells, tissues, and organs that coordinates and controls the functions of the body. It is responsible for receiving sensory information, processing it, and generating appropriate responses.

The skeletal system works as a support structure for your body. It gives the body its shape, allows movement, makes blood cells, provides protection for

organs and stores minerals.

The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs and blood vessels. The muscles that power your lungs are also part of the respiratory system.