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The pizza crust is a carbohydrate, this is because like other bread it contains starch.

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Cheese is a Lipid and a protein. It is a lipid because it is a form of fat, but it also does provide protein from dairy.

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The meat on the piece of pizza is a protein.

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Teeth are physically chewing to break down the food. This is mechanical digestion.

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Saliva is released into the mouth by ducts. It lubricates our mouth and brings enzymes salivary amylase which starts breaking down the carbohydrates, which turn into disaccharides.

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Our tongue mixes up the food and saliva into blouses for us to swallow. There are also taste buds located on the tongue that allow us to taste the flavours of the pizza.

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The swallowing process takes place in the pharynx. This is the part of the throat that is located behind the mouth and nasal cavity, and above the esophagus and trachea.

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The nasopharynx is an airway in our respiratory system. During the swallowing process, it is closed off by soft palet and uvula so we don't choke.

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Soft palet and uvual closing the nasopharynx 

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The glottis is the thinnest part of the larynx and it opens up to the airway. The epiglottis is a piece of cartilage that is shaped as a leaf, it acts as a barrier so that food does not enter the airway while swallowing.

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The esophagus opens up to carry bolus from the mouth to the stomach.

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The bolus going through the esophagus to the stomach. 

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The bolus enters the stomach through the cardiac sphincter.

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The stomach rugae (coiled sections of tissue that are found in the mucosal and submucosal layers of the stomach) can expand to hold 4L.

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The bolus is mechanically digested due to muscles in the stomach. It occurs from the peristaltic contractions of the smooth muscle from the fundus all the way to the contracted pylorus. The peristaltic contractions "churn" the bolus.

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Our stomach after using its muscels in mechanical digestion.

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Chemical digestion in the stomach is caused by gastric juices.  Our stomach has special "chief cells" which release important digestive enzymes. Pepsin is one of them, this breaks down proteins (meat on pizza) and turns them into peptides/amino acids. HCL is produced in the parietal cells of the stomach, it is used to break down protein to get its nutrients, and kill bacteria.

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Chyme is a semi-fluid mass of partly digested food that leaves the stomach by the pyloric sphincter.

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The small intestine is our major organ, it is around 6 meters. It is where nutrients get absorbed into the blood. The small intestine reaches from the pyloric sphincter to the ileocecal valve. Water is being absorbed throughout the small intestine, substances are also moved from the liver through the hepatic portal vein or lymph.

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The duodenum takes up 25cm of the small intestine. It is attached to the stomach where it receives chyme. The small intestine gets bile from the liver and pancreatic juice from the pancreas through the duct.

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The jejunum is the middle part of the small intestine. It is between the duodenum and the ileum. Its main job is the digestion and secretion of enzymes.

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The ileum is the last section of the small intestine, it reaches from the end of the jejunum to the large intestine. It absorbs bile salts and nutrients left over.

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Small intestine being the most important organ of the digestive system

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Ville is made up of mucosa and is a fingerlike structure. It helps to increase the surface area of the Small Intestine.
Microvilli are small projections of the plasma membrane and are on the absorptive cell.

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They break down double sugars into simple sugars and help with the digestion of protein.

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The large intestine absorbs water, salts, and in some cases vitamins. It gets rid of any food that is not able to be digested as feces. It does not have a role in the actual digestion of food.

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Goblet cells help by providing mucas to lubricate.

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There are no enzymes being produced during this process. Bacteria found in the large intestine digest any remaining nutrients.

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The connective tissue septa are used to separate the liver into lobules. Nerves, vessels, and ducts go along septa.
Lobules have portal triads at all corners. There are three important vessels, the hepatic portal vein, hepatic artery, and hepatic duct.

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The liver is a storage place for energy, it stores glycogen that came from glucose, fat, vitamins, copper, and iron.
All of the blood leaving the stomach and liver will go through the liver. During this, it breaks down and creates nutrients. It will also metabolize drugs so that our bodies can better handle them. Kupffer cells ingest (phagocytize) and old or dying blood cells, they then put out useful elements.

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The liver can produce around 600- 100 ml a day of bile. Thus bile can be made up of bile salts, cholesterol, lipids, fat-soluble hormones, and lecithin. This also helps with the neutralization of chyme with a pH of ~7-8. Bile that is made in the liver will be stored away in the gallbladder.

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The gallbladder is a muscular sac that is located under the liver.

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The bile from the liver is stored in the gallbladder. This bile leaves through the common duct and is used to break down fat into smaller parts.

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The gallbladder is a vestigial organ, meaning it is non-essential to our body.

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The pancreas has a head, body, and tail. It is located behind the stomach and acts as a gland in our nervous system. It is a heterocrine gland which means that it has an endocrine and a digestive exocrine function.

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Large intestine trying to absorb any left over water

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Endocrine: Produces insulin and glucagon and other important hormones and puts them directly into the bloodstream.
Exocrine: Make enzymes that are crucial for digestion.

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During the process of digestion, our pancreas makes pancreatic juices that are enzymes. These enzymes can be used to break down sugars, fats, and starches.

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Source- Salivary Glands
Target- Mouth
Substrate- Starch
Product- Maltose
Conditions- ~6.4-7 pH
Absorbed- Maltose is mainly absorbed in the small intestine

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Source- Gastric glands
Target- Stomach
Substrate- Proteins
Product- Peptides & Amino acids
Conditions ~2 pH
Absorbed- amino acids are mainly absorbed in the small intestine

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Source- Pancreatic Juices
Target- Duodenum
Substrate- Starch
Product- Glucose
Condition- ~6.7 - 7 pH
Absorbed- Starch is absorbed in the small intestine.

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Source- Pancreatic Juices
Target- Small Intesine
Substrate- Proteins
Product- Amino acids
Conditions 7-8 pH
Absorbed- amino acids are absorbed in the Small Intestine

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Source- Pancreatic Juices
Target- Small Intestine
Substrate- Lipids
Product- Fatty Acid/glycerol
Conditions- ~7-8 pH
Absorbed- the stomach and small intestine are responsible for breaking down fatty acids.

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Source- Pancreatic Juices
Target- Small Intestine
Substrate- DNA & RNA
Product- Nucleotide
Conditions- ~7-8 pH
Absorbed- nucleotides are absorbed in the small intestine

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Source- enzymatic hydrolysis of starch
Target- Small Intestine
Substrate- maltose
Product- Glucose
Conditions- ~6.5  pH
Absorbed- maltose is absorbed in the small intestine

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Source- Microvillia
Target- Small Intestine
Substrate- Polypeptides
Product- amino acids
Conditions- ~ 7.3–7.6 pH
Absorbed- amino acids are absorbed in the small intestine.

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Enzyms working hard in our digestive system

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Source- Stomach
Target- Stomach
Effect- Causes churning and more gastric juices released.

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Source- Duodenum (Small Intestine)
Target- (pancreas) Liver
Effect- Stimulates bicarboate into the biles.

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Source- DUodenum (Small Intestine)
Target- (pancreas) Gallbladder
Effect- To stimulate the gallbladder to contract.

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Chews up the pieces of pizza, turns it into a bolus and gets it ready to swallow.

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The pizza is now being swallowed and kept away from any air ways.

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The pizza (bolus) is being mechanically and chemically digested until it is turned into chyme. The pepperoni is being digested here because it is a protein.

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The Small Intestine absorbs most of the nutrients from the pizza and uses enzymes to digest the meat and some of the cheese.

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The Large Intestine absorbs any remaining nutrients from the pizza and absorbs the water from the bolus.

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The liver makes bile that is used to break down fats, aka the cheese from the pizza. The liver stores the energy made by eating the pizza.

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The bile made by the liver is stored in the gallbladder. The bile is used to break down fats from the pizza.

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The pancreas is in charge of making enzymes and moving them into the small intestine. Without this, the pizza would not be digested well.

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The rectum is 8 inches and connects the colon to the anus. It receives stool from the colon and signals when it is ready to be released.

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The anus controls the release of waste.

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The digestive system is in charge of digesting the nutrients, vitamins, and more from the food you eat and the liquid you drink. It is very important for growth, energy, and repairing cells.

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Th digestive system is made up of the gastrointestinal tract and some accessory organs.

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Here is a video of the digestive system in action

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The Digestive Process - how digestive system works