Introduction to the Digestive System
The digestive system is essentially a long tube which is about
six meters long and it runs all the way from the mouth right
down to the anus.. the purpose of digestion is to absorb
nutrients from the body sorry from food and into the body
and digestion involves breaking down the food so that it can
be easily absorbed. You 've got mechanical and chemical
digestion. So examples of mechanical digestion are chewing.
after food has entered the mouth it passes into the pharynx,
so the funks is this sort of muscular tube which joins onto
the nasal cavity in the the mouth and it connects them to
the esophagus and the larynx. The lungs is these these
structures anteriorly, which are commonly referred to as the
voice box. behind you 've got this tube which runs down at
the stomach and this is the esphagus so i 've. Just got rid of
the track here..
Mouth
Food begins its journey through the digestive system in the mouth, also known as the oral cavity.
Inside the mouth are many accessory organs that aid in the digestion of food—the tongue, teeth,
and salivary glands. Teeth chop food into small pieces, which are moistened by saliva before the
tongue and other muscles push the food into the pharynx.
Teeth. The teeth are 32 small, hard organs found along the anterior and lateral edges of
the mouth. Each tooth is made of a bone-like substance called dentin and covered in a layer
of enamel—the hardest substance in the body. Teeth are living organs and contain blood
vessels and nerves under the dentin in a soft region known as the pulp. The teeth are
designed for cutting and grinding food into smaller pieces.
Tongue. The tongue is located on the inferior portion of the mouth just posterior and
medial to the teeth. It is a small organ made up of several pairs of muscles covered in a thin,
bumpy, skin-like layer. The outside of the tongue contains many rough papillae for gripping
food as it is moved by the tongue’s muscles. The taste buds on the surface of the tongue
detect taste molecules in food and connect to nerves in the tongue to send taste
, information to the brain. The tongue also helps to push food toward the posterior part of
the mouth for swallowing.
Salivary Glands. Surrounding the mouth are 3 sets of salivary glands. The salivary glands
are accessory organs that produce a watery secretion known as saliva. Saliva helps to
moisten food and begins the digestion of carbohydrates. The body also uses saliva to
lubricate food as it passes through the mouth, pharynx, and esophagus.
Esophagus
The esophagus is a muscular tube connecting the pharynx to the stomach that is part of the upper
gastrointestinal tract. It carries swallowed masses of chewed food along its length. At the inferior
end of the esophagus is a muscular ring called the lower esophageal sphincter or cardiac sphincter.
The function of this sphincter is to close of the end of the esophagus and trap food in the stomach.
Intestines and Beyond
After the parsley digested food known as crime exits the stomach,
It enters into the small intestine. the small intestine is highly
convoluted. There 's all these folds and it 's really long and folded.
So this really really serves to increase the surface area, so it helps
by having a larger surface area. There is much more possibility for
absorption. the small intestine starts at the pylorus of the
stomach, and it ends up there cecum.. The large intestine lies
around the edges of the abdominal cavity. So you can see it sort of
relation to the skin. There. the function of the large intestine is to
absorb water. So the colon is separated into four parts. You 've got
the ascending colon, which is this first part on the right which
ascends and then the transverse colon, which descends down into the last part..
Accessory Organs
The three accessory organs we 've got in the abdomen are the liver, the gallbladder
and the pancreas. the liver receives nutrient rich blood from the gut via a vein called
the portal vein. The hepatic portal vein. it processes the products of digestion and also
The digestive system is essentially a long tube which is about
six meters long and it runs all the way from the mouth right
down to the anus.. the purpose of digestion is to absorb
nutrients from the body sorry from food and into the body
and digestion involves breaking down the food so that it can
be easily absorbed. You 've got mechanical and chemical
digestion. So examples of mechanical digestion are chewing.
after food has entered the mouth it passes into the pharynx,
so the funks is this sort of muscular tube which joins onto
the nasal cavity in the the mouth and it connects them to
the esophagus and the larynx. The lungs is these these
structures anteriorly, which are commonly referred to as the
voice box. behind you 've got this tube which runs down at
the stomach and this is the esphagus so i 've. Just got rid of
the track here..
Mouth
Food begins its journey through the digestive system in the mouth, also known as the oral cavity.
Inside the mouth are many accessory organs that aid in the digestion of food—the tongue, teeth,
and salivary glands. Teeth chop food into small pieces, which are moistened by saliva before the
tongue and other muscles push the food into the pharynx.
Teeth. The teeth are 32 small, hard organs found along the anterior and lateral edges of
the mouth. Each tooth is made of a bone-like substance called dentin and covered in a layer
of enamel—the hardest substance in the body. Teeth are living organs and contain blood
vessels and nerves under the dentin in a soft region known as the pulp. The teeth are
designed for cutting and grinding food into smaller pieces.
Tongue. The tongue is located on the inferior portion of the mouth just posterior and
medial to the teeth. It is a small organ made up of several pairs of muscles covered in a thin,
bumpy, skin-like layer. The outside of the tongue contains many rough papillae for gripping
food as it is moved by the tongue’s muscles. The taste buds on the surface of the tongue
detect taste molecules in food and connect to nerves in the tongue to send taste
, information to the brain. The tongue also helps to push food toward the posterior part of
the mouth for swallowing.
Salivary Glands. Surrounding the mouth are 3 sets of salivary glands. The salivary glands
are accessory organs that produce a watery secretion known as saliva. Saliva helps to
moisten food and begins the digestion of carbohydrates. The body also uses saliva to
lubricate food as it passes through the mouth, pharynx, and esophagus.
Esophagus
The esophagus is a muscular tube connecting the pharynx to the stomach that is part of the upper
gastrointestinal tract. It carries swallowed masses of chewed food along its length. At the inferior
end of the esophagus is a muscular ring called the lower esophageal sphincter or cardiac sphincter.
The function of this sphincter is to close of the end of the esophagus and trap food in the stomach.
Intestines and Beyond
After the parsley digested food known as crime exits the stomach,
It enters into the small intestine. the small intestine is highly
convoluted. There 's all these folds and it 's really long and folded.
So this really really serves to increase the surface area, so it helps
by having a larger surface area. There is much more possibility for
absorption. the small intestine starts at the pylorus of the
stomach, and it ends up there cecum.. The large intestine lies
around the edges of the abdominal cavity. So you can see it sort of
relation to the skin. There. the function of the large intestine is to
absorb water. So the colon is separated into four parts. You 've got
the ascending colon, which is this first part on the right which
ascends and then the transverse colon, which descends down into the last part..
Accessory Organs
The three accessory organs we 've got in the abdomen are the liver, the gallbladder
and the pancreas. the liver receives nutrient rich blood from the gut via a vein called
the portal vein. The hepatic portal vein. it processes the products of digestion and also
