Human Digestive System

Amoeba, being a unicellular organism without specialized excretory structures, removes undigested food through rupturing of its cell membrane. When the food vacuole reaches the cell surface, the membrane breaks open to expel the waste, and the membrane quickly repairs itself.

Assimilation is the stage where absorbed nutrients are utilized by cells for various functions - energy production through respiration, growth through cell division, and repair of damaged tissues. This is the final and most important stage of nutrition from the organism's perspective.

Amoeba is a unicellular organism without a circulatory system. It absorbs nutrients directly through its cell membrane by diffusion and uses cytoplasmic streaming to distribute materials within the cell. A blood system is a complex multicellular adaptation for transport that amoebas do not possess.

The food vacuole in amoeba is functionally analogous to a stomach because it's the temporary compartment where food is digested. When amoeba engulfs food through phagocytosis, the food becomes enclosed in a membrane-bound vacuole where digestive enzymes break it down. This is temporary because once digestion is complete, the vacuole fuses with the cell membrane to eject waste.

The sequential parts of the digestive system include the mouth, pharynx, esophagus, stomach, small intestine (duodenum, jejunum and ileum) and large intestine.

Gastritis is an inflammation of the lining of the stomach, and has many possible causes. The main acute causes are excessive alcohol consumption or prolonged use of nonsteroidal anti-inflammatory drugs (also known as NSAIDs) such as aspirin or ibuprofen.

Escherichia coli is a Gram-negative rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms (endotherms). Most E. coli strains are harmless.

Digested food materials to provide energy and growth of the body, hormones, metabolic wastes, enzymes, various gases (oxygen and carbon dioxide), etc. are transported from one part of the body to another. Hence, this option is the correct answer.

Pancreas are a gland organ in the digestive and endocrine system of vertebrates. It is both an endocrine gland producing several important hormones, including insulin, glucagon, and somatostatin, as well as an exocrine gland, secreting pancreatic juice containing digestive enzymes that pass to the small intestine.

The kidneys play key roles in body function, not only by filtering the blood and getting rid of waste products, but also by balancing levels of electrolyte levels in the body, controlling blood pressure, and stimulating the production of red blood cells.They do not secrete any digestive enzymes.

It is present in the duodenum and increases the migrating myoelectric complex component of gastrointestinal motility and stimulates the production of pepsin.

Tropical sprue is a malabsorption disease commonly found in the tropical regions, marked with abnormal flattening of the villi and inflammation of the lining of the small intestine.

Lipoprotein lipase encodes lipoprotein lipase, which is expressed in heart, muscle, and adipose tissue. Lipoprotein lipase functions as a homodimer, and has the dual functions of triglyceride hydrolase and ligand/bridging factor for receptor-mediated lipoprotein uptake.

Amylase is an enzyme that helps digest carbohydrates. It is produced mainly in the pancreas and the glands that make saliva. When the pancreas is diseased or inflamed, amylase releases into the blood.

The anus is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces. It is not a part of small intestine.