How Many Systems Are in The Human Body
There are 14 systems that make up the human body.
- The Circulatory or Cardiovascular System
(Heart, Blood Vessels (Arteries, Capillaries, Veins).)
- The Digestive or Gastrointestinal System
(Mouth, Esophagus, Stomach, Small intestine, Large intestine)
- The Endocrine or Glandular or Hormonal System
(Hypothalamus, Pituitary, Thyroid, Parathyroids, Adrenals, Pineal body, Ovaries and Testes.)
- The Excretory System
(Small and Large Intestines, Rectum, and Anus)
- The Dermal or Integumentary System
(Skin, Hair, Nails, Sweat Glands)
- The Muscular System
(Muscles (Smooth, Cardiac, and Skeletal Muscles.))
- The Nervous System
(Brain, Spinal Cord, Nerves)
- The Reproductive System
Male (Penis and Testes) Female ( Vagina, Uterus, Ovaries)
- The Respiratory or Pulmonary System
(Nose, Pharynx, Larynx, Trachea, Bronchi, Alveoli, Bronchioles Lungs.)
- The Skeletal System
(Bones, Bone Marrow, Joints, Teeth, Ligaments, Cartilage)
There are 3 subsystems of the Circulatory or Cardiovascular System.
- The Immune System
(Bone Marrow, Thymus, Gland, Spleen, Lymph Nodes)
- The Lymphatic System
(Ducts and Lymph Nodes) [Palatine Tonsil, Thymus Gland]
- The Urinary System
(Kidneys, Gallbladder, Ureter, Urethra)
There is 1 sub-system of the Nervous System.
- The Sensory System
(Senses of sight, hearing, feeling, smelling, tasting, and balance)
But there are only 8 major organ systems in the body. They are: the skeletal, muscular, nervous, digestive, respiratory, cardiovascular, reproductive, and urinary systems.