The skeletal system consists of bones and their associated connective tissues, including cartilage, tendons, and ligaments. It consists of dynamic, living tissues that are capable of growth, detect pain stimuli, adapt to stress, and undergo repair after injury.
The nervous system is involved in some way in nearly every body function. All the sensations, actions, and emotions are made possible by the nervous system, which consists of the brain, spinal cord, nerves, and sensory receptors.
The integumentary system consists of the skin and accessory structures, such as hair, nails, and glands. The integumentary system is recognizable to most people because it covers the outside of the body and is easily observed.
Much like sanitation workers who keep a city’s water supply drinkable and dispose of its waste, the kidneys are usually unappreciated until there is a malfunction and “internal garbage” piles up.