Answer:
Nervous System
Principle parts: The CNS (brain and spinal cord), peripheral nervous system ( nerves which originate from the spinal cord).
Primary function: To collect information, interpret it and produce output or action.
Circulatory System
Principle parts: Heart, blood vessels, blood
Primary function: responsible for the flow of blood, nutrients and gases.
Digestive System
Principle parts: Mouth, salivary glands, pharynx, esophagus, stomach, small intestine, large intestine, rectum
Primary function: Breakdown of food and its absorption.
Skeletal System
Principle parts: Bones, cartilage, ligaments
Primary function: To provide support and movement of the body.
Excretory system
Principle parts: Kidneys, liver, large intestine, Ureter, Urethra, urinary bladder
Primary function: To get rid of waste materials of the body.
Endocrine System
Principle parts: Pituitary, hypothalamus, thyroid, adrenals, ovaries, testes, parathyroids
Primary function: Regulate the activities of cells or organs, sexual development, production of various hormones.