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.