Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.

Force is applied to change an object's speed or direction of motion.

The liver produces bile which emulsifies (separates) fat.

Found in both animal sources (meat, fish, eggs, cheese) and vegetables (beans, nuts, some grains), proteins are important for the body's maintenance, growth, and repair.

The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.