Human Body Basics

connect muscles to bones to allow movement

transmits nerve signals between the brain and body

produce hormones that respond to stress

filter substances and contain infection-fighting cells

serves as the main airway to the lungs

connect bones to other bones at joints

filters old blood cells and helps the immune system

transports food from the throat to the stomach

stores and concentrates bile from the liver

contracts to pull air into the lungs

regulates metabolism and energy levels

produces insulin and digestive enzymes

absorbs nutrients from digested food

contract to produce movement and heat

stores urine before it leaves the body

absorbs water and forms solid waste

breaks down food with acid and enzymes

filters toxins and produces bile

filter waste from blood to produce urine

provides structural support and protects organs

protects the body and regulates temperature

directs the nervous system and many body functions

exchange oxygen and carbon dioxide

pumps blood through the body