Human digestive system

digestive systemdigestivedigestive tractaccessory organs of digestiondigestionGastrointestinalaccessory digestive organalimentary systemdigestive healthdigestive problems
See also gastrointestinal tract.wikipedia
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Pancreas

pancreaticexocrine pancreaspancreatic development
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).
The pancreas is an organ of the digestive system and endocrine system of vertebrates.

Tongue

Glossusforamen cecumblade
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).
It has importance in the digestive system and is the primary organ of taste in the gustatory system.

Digestion

digestivedigestdigested
The process of digestion has three stages.
In the human digestive system, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of saliva.

Large intestine

coloncolorectallarge bowel
Water and some minerals are reabsorbed back into the blood in the colon of the large intestine.
The large intestine, also known as the large bowel, is the last part of the gastrointestinal tract and of the digestive system in vertebrates.

Muscle

musclesmuscularmusculature
Peristalsis is the rhythmic contraction of muscles that begins in the esophagus and continues along the wall of the stomach and the rest of the gastrointestinal tract.
They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.

Human feces

stoolfecesstools
The waste products of digestion (feces) are defecated from the anus via the rectum.
Human feces have similarities to feces of other animals and vary significantly in appearance (i.e. size, color, texture), according to the state of the diet, digestive system and general health.

Esophagus

oesophagusesophageallower esophageal sphincter
This produces a bolus which can be swallowed down the esophagus to enter the stomach.
The esophagus is one of the upper parts of the digestive system.

Lymphatic system

lymphoidlymphoid tissuelymphatic
This initially results in the production of chyme which when fully broken down in the small intestine is absorbed as chyle into the lymphatic system.
The tonsils are lymphoid organs that are also associated with the digestive system.

Taste receptor

Taste2bitter taste receptorstaste cells
These include the various cells of the gastric glands, taste cells, pancreatic duct cells, enterocytes and microfold cells.
Beyond the papillae, taste receptors are also in the palate and early parts of the digestive system like the larynx and upper esophagus.

Stomach

gastriccardiafundus
This produces a bolus which can be swallowed down the esophagus to enter the stomach.
In the human digestive system, a bolus (a small rounded mass of chewed up food) enters the stomach through the esophagus via the lower esophageal sphincter.

Biological system

biological systemsbody systemsorgan system
The largest structure of the digestive system is the gastrointestinal tract (GI tract).

Lipase

lipaseslipase LIPFE1104
Lipase is a digestive enzyme that catalyses the hydrolysis of lipids (fats).
For example, human pancreatic lipase (HPL), which is the main enzyme that breaks down dietary fats in the human digestive system, converts triglyceride substrates found in ingested oils to monoglycerides and two fatty acids.

Pharynx

nasopharynxoropharynxpharyngeal
The pharynx is a part of the conducting zone of the respiratory system and also a part of the digestive system.
In humans, the pharynx is part of the digestive system and the conducting zone of the respiratory system.

Pepsin

pepsinogenpep''sinpepsin a
Pepsinogen is a precursor enzyme (zymogen) produced by the gastric chief cells, and gastric acid activates this to the enzyme pepsin which begins the digestion of proteins.
It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food.

Abdomen

abdominalabdominal musclesbelly
It is divided into cervical, thoracic and abdominal parts.
The abdomen in vertebrates contains a number of organs belonging to, for instance, the digestive system, urinary system, and muscular system.

Mucus

mucousmucinousslime
Gastric acid, and the production of mucus in the stomach, are essential for the continuation of digestion.
In the human digestive system, mucus is used as a lubricant for materials that must pass over membranes, e.g., food passing down the esophagus.

Liver

hepaticliver protein synthesislivers
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).
The liver is an accessory digestive organ that produces bile, a fluid containing cholesterol and bile acids, and an alkaline compound which helps the breakdown of fat.

Salivary gland

salivarysalivary glandsminor salivary gland
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).

Human waste

excretahuman excretaordure
The remaining semi-solid waste is termed feces and is removed by the coordinated contractions of the intestinal walls, termed peristalsis, which propels the excreta forward to reach the rectum and exit via defecation from the anus.
Human waste (or human excreta) refers to the waste products of the human digestive system and the human metabolism, namely feces and urine.

Small intestine

small bowelsmall intestinessmall
This initially results in the production of chyme which when fully broken down in the small intestine is absorbed as chyle into the lymphatic system.

Gallbladder

gall bladdergall-bladderHartmann's pouch
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).

Sublingual gland

sublingualsublingual salivary glandRivinus ducts
The third pair are the sublingual glands located underneath the tongue and their secretion is mainly mucous with a small percentage of saliva.

Gastrointestinal tract

intestinegastrointestinaldigestive tract
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Peristalsis is the rhythmic contraction of muscles that begins in the esophagus and continues along the wall of the stomach and the rest of the gastrointestinal tract. The largest structure of the digestive system is the gastrointestinal tract (GI tract).
However, the complete human digestive system is made up of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver and gallbladder).

Circulatory system

cardiovascularcirculationcardiovascular system
Most of the blood is returned to the liver via the portal venous system for further processing and detoxification before returning to the systemic circulation via the hepatic veins.
Also, the digestive system works with the circulatory system to provide the nutrients the system needs to keep the heart pumping.

Thoracic cavity

chest cavityintrathoracicthoracic
The muscular diaphragm separates the thoracic cavity from the abdominal cavity where most of the digestive organs are located.