Digestive Systems Of The Earthworm, The Starfish, The Fuetal Pig

6. Continue cutting the skin of the earthworm towards the anterior end. It is best to use an upward-pointing direction with the scissors. As you cut the skin, pin back the skin to expose the gut.

The esophagus receives food from the mouth after swallowing and then delivers it to the stomach. The stomach holds food which it is being mixed with enzymes which continue the process of breaking down the food into a useable form. When the contents of the stomach are processed they are released into the small intestine. In the small intestine food is broken down by enzymes released from the pancreas and bile from the liver, the food is moved through and mixed with digestive secretions. The small intestine is made up of three segments the duodenum, jejunum and the ileum, the jejunum and the ileum are mainly responsible from the absorption of nutrients in to the bloodstream. These contents start out semi-solid and end in a liquid form after passing through the organ. Water, bile, enzymes and mucous change its consistency, one the nutrients have been absorbed it then moves onto the large intestine. The large intestine connects to the rectum and is specialised in processing water so that emptying the bowels is easy.

The brown pelican has an intricate digestive system in its body. For example, the bird’s digestive system is specially adapted for consuming fish. In contrast, Pelecanus occidentalis cannot digest large fish bones, such as those from different kinds of sport fishes. Bird beaks and bills act as a mouth for the pelican. When food enters the birds’ bill, the food is sent down the esophagus to the stomach (proventriculus). The pelican then stores the food in the crop, a temporary storage solution for food for birds (Kennedy, 2005). In addition, the crop also allows the pelicans’ food to soften after entering the stomach. There are two parts of the stomach in Pelecanus occidentalis: the proventriculus and the gizzard (Kendrick 2010). In the proventriculus, specialized cells secrete pepsin. Furthermore, the food is then passed on to the gizzard, where it grinds it down to make it easier for the digestive enzymes to break down the food. Another part of the pelican’s digestive system is the small intestine, where food is digested and absorbed. The last part of the bird’s digestive system is the cloaca, which holds the waste products of digestion until they are expelled out through the vent. In addition, the large intestine connects the small intestine to the cloaca.

Digestion starts in mouth and it is going through several steps. Teeth which are a Mechanical digestion start tearing and crushing the food down into small pieces so that the food will smoothly run down our throat. The salivary glands are located underneath the back of our tongues and that’s what is creating our saliva. The saliva is the Chemical Digestion is helping soften the food in the mouth so it is easy to swallow. Also saliva is the first out of several chemicals that is breaking the food into smaller bits. The tongue is the muscle that works with the food and saliva to form something similar to balls that can be swallowed. Also tongue contains taste buds so that we know if the food is salt, sweet, sour or bitter. Esophangus is a simple transportation tube that is joining the throat with stomach. When swallowing we are closing a trap door in our throats called the epiglottis. By closing this trap we are preventing the food prom going to trachea and into our lungs. Also Food moves down the esophangus using muscles not gravity. Stomach is the first stop after the Esophangus. When the food gets into stomach the stomach uses chemicals to try to make the food smaller. These chemicals are called gastric juices and they include hydrochloric acid and enzymes. (Enzymes are

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First of all, the human body, crayfish, earthworm, and frog all have many similarities and differenced about how their digestive system works. They all eat their food through their mouths and the food then travels into the esophagus. The esophagus prepares the food for further digestion. The food in the esophagus then travels in the frog, crayfish, and human body’s stomach. The earthworm doesn’t have a stomach, but it has a crop that serves as a storage stomach. Once the food is in the stomach, something different happens for each organism. The food in the crayfish travels to the digestive gland which produces digestive substances and from which the absorption of nutrients occurs. The same thing occurs in a frog and the human body, but instead of a digestive gland it is moved into a small intestine. In the earthworm, the food goes from the stomach to the gizzard, which uses stones that the earthworm eats to grind the food completely. After it is moved into the digestive gland, small intestine, or gizzard, the food is mostly digested. The earthworm and human body’s food is now moved into the larger intestine, where it absorbs water and any remaining nutrients. The frogs food is stored in something like a large intestine, but it is called the gallbladder. The crayfish only has on intestine. After going through all this, the undigested material leaves through the anus, or for a frog, it is called the cloaca.

The digestive system of a pig is classified as monogastric or non-ruminant, which is having a stomach with only a single compartment, like humans. In addition, the digestive tract of the pig has five main parts, including the mouth, esophagus, stomach, and small and large intestines. Furthermore, the mechanical breakdown of the food begins upon the entrance of the mouth in the digestive tract. Basically, the food is grinded into smaller pieces by its teeth. Next, saliva is produced in the mouth, acting to moisten the small food particles, along with an enzyme that starts the digestion of the starch. Then, the food is pushed towards the esophagus with the help of the tongue. Primarily, the esophagus carries the food from the mouth to the stomach, being a tube, which is carried out with the help of a series of muscle contractions that push the food towards the stomach. Subsequently, after the first of the contractions, swallowing, has taken place, the cardiac valve, located at the end of the esophagus, prevents food from passing from the stomach back to the esophagus. Likewise, the stomach comes next in the digestive tract; it serves as a reaction chamber, adding chemicals to the food. Also, hydrochloric acid and enzymes help break down food into small particles of carbohydrates, protein, and fats. Additionally, some particles are absorbed into the bloodstream, from the stomach, while others cannot be absorbed by the stomach, being passed to the small intestine through the pyloric valve. Moreover, the small intestine aids

Our mouth, esophagus, stomach, pancreas, liver, gallbladder, large intestine, small intestine, rectum, and anus come together to form the digestive system which breaks down our food into simpler molecules. The food enters through the mouth, travels down the esophagus, breaks down in the stomach, pancreas, liver, and gallbladder and then moves through the intestines down to the rectum and anus. A pig’s digestive system is no different than a human’s. A foregut, midgut, hindgut, and a digestive gland form the digestive system of a crayfish. The foregut contains the stomach (partially breaks the food down), the

It’s a typical day. After school you get home and you are starving, but you just want a snack. “What should I eat?,” you ask yourself. Then, after looking through the cabinets for a few minutes, you find Cheetos and decide to eat a few. With just the presence of those Cheetos in your sight, the digestion process begins in your 9 meter long digestive tract.

Just last month, a deadly worm was found in not one, but four locations in the U.S. state of Florida. This worm, until recently, was documented in only twenty-one countries, most of which were island nations. Although the New Guinea Flatworm may seem as a highly dangerous predator, it is only about two inches in length and mainly targets snails for its nutrition. These worms are not harmful to humans, but they will feast on any soft creature in the soil. In order to eat snails or any critters with a hard shell, the New Guinea Flatworm latches itself onto the shell’s opening and then spits out its own stomach through the opening in its belly. This allows an acidic goo to dissolve the snail’s flesh and the worm can continue on with its meal by swallowing both its stomach and the snail.

When society thinks about crayfish and earthworms they become extremely curious about how their bodies operate because of how they are made up. I will give a brief synopsis of both animals before going into major detail about them. According to the online website named dictionary.com, it says that an earthworm is a burrowing annelid worm that lives in the soil. Earthworms play an important role in aerating and draining the soil and in burying organic matter (Dictionary). Crayfish are nocturnal freshwater crustacean that resembles a small lobster and inhabits in streams and rivers (Dictionary). Crayfish and earthworms are some very interesting animals that possess some exclusive qualities both similar and different.

What are the three sections of the large intestine and what roles does each play in digestion or absorption?

Once again my mini-sub and I will be miniaturized (8 microns long) and witnessing another ‘Fantastic Voyage’ in a human body. This time I will be swallowed by George, a 55 years old man, while he is eating his meal consisting of a hamburger, French fries and a soda. I will pilot my mini-sub through George’s GI (gastrointestinal tract), which is the tube that starts with the mouth and proceeds to the esophagus, stomach, duodenum, small intestine, large intestine (or colon), rectum and, finally, the anus (Pansky, 2007). Along this pathway I will describe the digestion of George’s meal and the major structures that I will encounter. Arrived to the distal

Food is digested by being broken down, by a variety of enzymes, into useful nutrients, which are transported around the body to places where they can be of use, and into waste products, which are excreted from the body. The digestive system is made up of a number of organs, oesophagus, stomach, liver, pancreas, gallbladder, and small and large intestines, these are then separated into the digestive tract and the digestive organs. The digestive tract is, essentially, a single continuous tube that begins at the mouth and ends at the anus, in a fully grown adult it is approximately seven metres long. Food travels through the digestive tract and the digestive organs produce the enzymes and chemicals that are responsible for

The digestive system is very important in digesting food and breaking it down so it can be digested easily. The digestive system turns food into energy. Throughout the process there are nutrients which are absorbed. There are many things that contributed to the digestive system such as the mouth which produces saliva which helps to break down food and nutrients such as carbohydrates with the help of an enzyme called amylase. The major food groups which are called macro nutrients include carbohydrates, proteins and fats. All of these nutrients play an important role in the body. There are also many micro-nutrients which include vitamins and minerals which provide the body with health and well-being. The digestive system is made up of the mouth, which includes the teeth (the teeth are used to cut and grind food into smaller pieces, they contain blood vessels and nerves), tongue (the tongue is a muscle that has a rough surface including the taste buds), salvia glands (they produce salvia which moistens the food to make is easier to digest), the pharynx (this helps the food travel to the stomach, the pharynx also plays an important role in the respiratory system. It also contains 2 different flaps to separate the 2 functions), esophagus (this connects the pharynx to the stomach and transports chewed food to the stomach), stomach (this is a muscle that is