A pleasant day to all! Here are 10 illustrations of slides as examples driven from the digestive system, whether it is from a human being, frog, or a cat. I do hope that from these slides, you can gather more information and learn from the various structure and function that the digestive system is comprising of:

[1] HUMAN LARGE INTESTINE, c.s.
🔬 Objective/s Used: High-Power Objective (HPO)
📚 Description: Consisting of the cecum, colon, rectum, and anus, the large intestine in humans forms the terminal portion of the gastrointestinal tract (GIT). Other than the term “large intestine,” it can also be referred to as the “colon,” which proposes how it belongs to one of its main sections. The large intestine has a structure that emphasizes its physical characteristics by being wider yet shorter than the small intestine. According to Britannica (2024), the large intestine measures an estimated 1.5 meters in length, while the small intestine goes beyond reaching a rough estimate of 7.6 meters. Moreover, the large intestine’s main job is to absorb water and electrolytes from the residues of the digestive tract and store fecal matter that awaits elimination. Given this, the large intestine participates in movements described as churning to effectively expose digestive residues to its absorptive surfaces and, through gastrocolic reflex, pushes the contents toward the anus for expulsion.

[2] CAECUM, c.s.
🔬 Objective/s Used: Low-Power Objective (LPO)
📚 Description: Recognizing the large intestine means knowing that it starts at the caecum. Food that has yet to be digested leaves the small intestine and enters the caecum, a large, pouch-shaped organ in the lower abdominal cavity. The valve that regulates food passage to the cecum separates the comparable ileum—the last segment of the small intestine—from the caecum, according to Britannica (2024). Furthermore, the caecum’s inner surface is covered in thick mucus membranes that facilitate absorption. Considering this, understanding the function of the caecum in the digestive system involves absorbing the leftover liquids and salts once the small intestine has completed the stages of digestion and absorption. Thus, as the caecum bears a layer of muscle beneath the lining, it solidifies the stance of offering a hand in mixing food contents via churning movements.

[3] FROG SMALL INTESTINE, c.s.
🔬 Objective/s Used: High-Power Objective (HPO)
📚 Description: A frog’s small intestine is supported by the mesentery, a membrane that resembles a fan. Structurally, the frog’s small intestines’ inner lining is formed by low transverse folds (Testbook, 2023). Considering the upper portion of the intestine, the duodenum forms a U-shape with the stomach as it spirals upward. In contrast, the ileum, a winding section of the frog’s small intestine, goes downward instead. A frog’s small intestine is vital to its digestive process since it is responsible for additional digestion and the absorption of nutrients. Starting with the anterior duodenum, which uses digesting enzymes, nutrients are absorbed into the bloodstream via the expanded posterior ileum. The frog’s efficient system enables it to extract maximum nutrients from its food, essential for sustaining its overall health and energy levels.

[4] HUMAN STOMACH, cardiac c.s.
🔬 Objective/s Used: Low-Power Objective (LPO)
📚 Description: An organ characterized by a J shape is the stomach, which in return breaks down food. The stomach is found being included as a portion of the gastrointestinal tract. As part of the digestive system, the human stomach produces acids, referred to as digestive juices, and enzymes that come together to break down food so that it can then be transferred toward further processing in the small intestine (Professional, n.d.). In recognition the stomach functions not just for breaking down foods, but also as being a temporary storage site for partially digested food. More to it, comprising the stomach is its muscular contractions that aid in enhancing the breakdown process of food particles. Therefore, the human stomach is an essential componet of the digestive system.

[5] FROG STOMACH, c.s.
🔬 Objective/s Used: High-Power Objective (HPO)
📚 Description: A frog’s stomach is on the left of the body cavity, where a mesogaster connects it to the dorsal body wall. It aids in the breakdown of food consumed with the assistance of digestive enzymes from the walls of the digestive glands. More to it, the frog’s stomach’s inner lining has multitudes of longitudinal folds that signal the stomach’s participation to expand when needed (BYJU’s, 2023), such as how the stomach functions in humans. Food is broken down in the frog’s stomach by releasing digestive fluids and enzymes. It also acts as a temporary holding area for partially digested food before it is transferred to the small intestine for additional processing, similar to the methods done in humans.

[6] DUODENUM HUMAN, c.s.
🔬 Objective/s Used: Oil-Immersion Objective (OIO)
📚 Description: A horseshoe—or C-shaped section of the small intestine, the duodenum, is situated under the stomach. The pancreas gathers pancreatic digestive enzymes as the duodenum is shaped like a C for digestion—additionally, a structure known as the hepatoduodenal ligament joins the duodenum to the liver (Christiansen, 2024). From this, bile goes into the duodenum and fuses with chyme, considering that it is an essential step in digestion. From this, the central role of the duodenum in the digestive system is to start the body’s digestion process by breaking down and absorbing nutrients. Given this, the duodenum’s primary role is to start the body’s digestion process.

[7] LIVER HUMAN, c.s.
🔬 Objective/s Used: Oil-Immersion Objective (OIO)
📚 Description: To start, the upper right region of the abdomen, just behind the diaphragm, contains the liver of an individual. Although this can vary from person to person, it usually weighs about 3 pounds (Newman, 2023). The liver is the largest and lightest organ compared to the skin. There are two lobes in the liver, a larger right lobe, and a smaller left lobe. The liver is about triangular. In the resting state, the liver eliminates toxins from the blood, breaks down nutrients taken in from the digestive system, and controls blood coagulation. Bile, which is necessary for breaking down fats and absorbing vitamins that are soluble in fat, is another function of the liver.

[8] HUMAN TONGUE POSTERIOR, c.s.
🔬 Objective/s Used: Low-Power Objective (LPO)
📚 Description: Nestled within the mouth, the tongue is a multipurpose, highly functional muscle organ that is integral to many vital activities, such as digestion and speech. It is an important part of the digestive system that actively manipulates food to help with chewing and swallowing, which improves the efficiency of the digestive system (Cleveland Clinic, n.d.). In addition to its role in digestion, the tongue plays a crucial role in allowing people to make a wide range of sounds that are essential for efficient and understandable spoken language. It has the unusual capacity to change its position and shape, which is essential for pronouncing various letters and words. Thus, the tongue as a powerful muscle proves to be a significant aspect of the digestive system.

[9] TONSIL HUMAN, section
🔬 Objective/s Used: Oil-Immersion Objective (OIO)
📚 Description: Two fleshy masses in the back of the throat (pharynx) are called the tonsils, also referred to as the palatine tonsils or faucial tonsils. In offering what they can do, they work as lymph nodes to protect the body from infection, and their main job as immune system components is to filter out germs that enter through the mouth or nose (Cleveland Clinic, n.d.). As it is most commonly seen, a disorder known as tonsillitis can occur when infections are found, causing the tonsils to swell and become inflamed. It is worth noting how the tonsils are also part of the immune system; they can sometimes become persistently infected or produce obstructive symptoms. Such that, as individuals we must provide care towards our tonsils as much as we take care of our other body parts.

[10] HUMAN ESOPHAGUS, upper region sect.
🔬 Objective/s Used: Low-Power Objective (LPO)
📚 Description: As it descends from the mouth to the stomach, the muscular tube known as the esophagus passes through the diaphragm. According to Eldridge (2022), an adult’s length of the esophagus typically falls between 9 and 10 inches (25 cm). Provided with information, the esophagus transports food, and liquids from the mouth to the stomach, and it is situated in front of the spine and behind the trachea. All of this can be made possible with the help of peristalsis, the rhythmic contraction aiding vital processes. It propels the material that is being swallowed downward and overcomes gravity. Therefore, with the presence of the esophagus, eating food for further digestion has never been simpler.

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References:

Admin. (2023, September 6). Digestive system of frog – Digestive structures and digestive physiology of frogs. BYJUS. https://byjus.com/neet/digestive-system-of-frog/

Britannica, T. Editors of Encyclopaedia (2024, March 19). cecum. Encyclopedia Britannica. https://www.britannica.com/science/cecum

Britannica, T. Editors of Encyclopaedia (2024, April 3). large intestine. Encyclopedia Britannica. https://www.britannica.com/science/large-intestine

Christiansen, S. (2024, January 4). Duodenum: anatomy, location, and function. Verywell Health. https://www.verywellhealth.com/duodenum-anatomy-4780308

Eldridge, L., MD. (2022, February 6). The structure, function, and conditions of the esophagus. Verywell Health. https://www.verywellhealth.com/esophagus-function-and-conditions-2249096

Newman, T. (2023, November 15). What does the liver do? https://www.medicalnewstoday.com/articles/305075

Professional, C. C. M. (n.d.). Stomach. Cleveland Clinic. https://my.clevelandclinic.org/health/body/21758-stomach

Professional, C. C. M. (n.d.-b). Tongue. Cleveland Clinic. https://my.clevelandclinic.org/health/body/22845-tongue

Professional, C. C. M. (n.d.-c). Tonsils. Cleveland Clinic. https://my.clevelandclinic.org/health/body/23459-tonsils

Testbook. (2023, August 30). Digestive system of frog – Detailed explanation and structure. Testbook. https://testbook.com/biology/digestive-system-of-frog