TheOrgans

An organ is a collection of tissues that act together to perform a function(s). Organs form systems which are defined as a collection of organs that act together to perform a function(s). When trying to narrow down how many organs a human body has, many dilemmas form. Organs are complex, and mattering on how you categorizing them, it can lead to thousands of organs. The main debate comes down to lumpers and splitters.

The minimal list of organs could look something like the this:

Circulatory system

heart
arteries
veins
capillaries
cisterna chyli
spleen

Lymphatic system (a part of the circulatory system)

- thoracic duct
- right lymphatic duct
- lymph vessels
- tonsils,
- adenoids
- thymus
- spleen.
- lymph nodes

Digestive system

teeth
tongue
salivary glands (3 pair)
esophagus
stomach
liver
gallbladder
pancreas
small intestine
large intestine
rectum
anus

Endocrine system

hypothalamus
pituitary gland
pineal body
thyroid gland
parathyroids
suprarenal glands

Integumentary system

skin, hair and nails and associated glands, including mammary glands.
The skin with its associated structures is sometimes considered an organ.

Muscular system

The individual muscles of the body.

Nervous system

brain
spinal cord
peripheral nerves

Reproductive system

Female:

ovaries
fallopian tubes
uterus
clitoris
vagina

Male:

testes
vas deferens
seminal vesicles
prostate
penis

Respiratory system

pharynx
larynx
trachea
bronchi
lungs
diaphragm

Skeletal system

The individual bones of the skeleton and associated ligaments and other structures.

In a normal human adult there are 206 regularly occurring bones, plus a variable number of sesamoid bones that may appear in tendons of muscles.

Excretory system

kidneys
ureters
bladder
urethra

Organs of Special Sense

eyes
olfactory bulbs
vomeronasal organ
vestibulocochlear organ
taste buds of the tongue

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Organ

Function

	Heart	The chambered muscular organ that pumps blood received from the veins into the arteries, thereby maintaining the flow of blood through the entire circulatory system to supply oxygen to the body.
	Spleen	The organ that is responsible for purifying the blood as well as storing blood cells.
	Stomach	The enlarged, saclike canal, one of the principal organs of digestion, located between the esophagus and the small intestine.
	Liver	A large, reddish-brown, organ located in the upper right portion of the abdominal cavity that secretes bile and is active in the formation of certain blood proteins and in the metabolism of carbohydrates, fats, and proteins.
	Gallbladder	A small, pear-shaped muscular sac, located under the right lobe of the liver, in which bile secreted by the liver is stored until needed by the body for digestion.
	Pancreas	A long, irregularly shaped gland in vertebrates, lying behind the stomach, that secretes pancreatic juice into the duodenum and insulin, glucagon, and somatostatin into the bloodstream.
	Small Intestine	The upper portion of the bowel, in which the process of digestion is practically completed. It is narrow and contorted, and consists of three parts, the duodenum, jejunum, and ileum.
	Large Intestine	Beginning with the cecum and ending with the rectum; includes the cecum and the colon and the rectum; extracts moisture from food residues which are later excreted as feces
	Brain	The brain is the master control center of the body. It receives information through the senses from inside and outside of the body. It analyzes this information then sends messages to the body that controls its functions and actions. The brain remembers past experiences, is the source of thought, moods, and emotions.
	Lungs	Either of two spongy, saclike respiratory organs in most vertebrates, occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen.
	Diaphragm	The main muscle used in the process of inspiration or breathing in. It is a dome-shaped sheet of muscle that is inserted into the lower ribs.
	Kidneys	A pair of organs functioning to maintain proper water and electrolyte balance, regulate acid-base concentration, and filter the blood of metabolic wastes, which are then excreted as urine.
	Bladder	A hollow muscular organ that stores urine before expelling it from the body.