Body systems
Twelve systems, each with a 3D view, the nursing assessment, common conditions, labs and practice questions.
- Skeletal system 206 bones that hold you up, protect your organs and make your blood.
- Muscular system More than 600 muscles that move you, hold you upright and keep you warm.
- Cardiovascular system A four-chamber pump and about 100,000 km of vessels that never stop.
- Respiratory system About 20,000 breaths a day to bring oxygen in and carry carbon dioxide out.
- Nervous system About 86 billion neurons that sense, decide and command.
- Special senses: eye and ear Specialized organs that turn light and sound into nerve signals.
- Digestive system A 9-meter tube and its helper organs that turn food into fuel.
- Urinary system Two kidneys that filter about 180 liters of blood plasma every day.
- Endocrine system Glands that send chemical messages through the blood.
- Lymphatic and immune system A drainage network and an army of cells that defend the body.
- Reproductive system Organs that produce gametes and sex hormones, and, in females, support pregnancy.
- Integumentary system The body's largest organ: about 2 m² of protection, sensation and temperature control.