Digestion

The process of obtaining food is known as ________ and requires specialized feeding mechanisms. a. ingestion b. digestion c. absorption d. excretion

An advantage of a complete digestive system over a gastrovascular cavity is that the complete system ________. a. excludes the need for extracellular digestion b. allows for specialized regions with specialized functions c. allows extensive branching d. facilitates intracellular digestion

Because the foods eaten by animals are often composed largely of macromolecules, animals need to have mechanisms for ________. a. dehydration synthesis b. enzymatic hydrolysis c. regurgitation d. demineralization

The process by which digested dietary substances cross cell membranes to be used by the body is known as ________. a. ingestion b. digestion c. hydrolysis d. absorption

Mechanical digestion, the process of breaking down large chunks of food into smaller pieces, is important because smaller pieces of food ________. a. do not taste as good as larger pieces of food b. have more surface area for chemical digestion than do larger pieces of food c. are easier to excrete than are larger pieces of food d. are more easily stored in the stomach than are larger pieces of food

The large surface area in the gut directly facilitates ________. a. secretion b. absorption c. filtration d. temperature regulation

A relatively long cecum is characteristic of animals that are ________. a. carnivores b. herbivores c. autotrophs d. omnivores

Which of the following organs is incorrectly paired with its function? a. stomach—protein digestion b. large intestine—bile production c. small intestine—nutrient absorption d. pancreas—enzyme production

The diagram below shows how glucose and other nutrients are transported from the inside of the intestine (intestinal lumen), through an intestinal epithelial cell, into the extracellular fluid for delivery to the bloodstream. There are different proteins on either side of the epithelial cell as shown in the diagram. The color of the proteins is consistent within any given type of membrane transport.a) Fill in the inferred relative concentrations of Na + ions and amino acids with High or Low on the lines below. Use the information provided for glucose to help you infer solute concentrations.b) For each of the three letters (A, B and C) associated with the thick arrows, please describe the type of protein depicted, the type of transport it engages in and be specific about the source of energy used.

Below is a diagram of an epithelial cell sitting at the border between your intestinal tract and the nearest blood vessel. This cell is busy transporting water soluble vitamins (yellow dots) from your intestine into your blood stream. Each arrow shows the direction of the solutes as they move through the different transport proteins.i) Name the type of transport protein ina) A: b) B:c) C: ii) One of the three proteins (A-C) contains a mistake. Please identify the mistake and correct it.

Which of the following statements regarding digestion and absorption of carbohydrates is true?a. Carbohydrate digestion begins in the stomach.b. Lactose intolerance results from an insufficiency of the enzyme, amylase.c. Digestible polysaccharides are broken down into the monosaccharides glucose, galactose and fructose, which can be absorbed.d. Sucrose is the main form of carbohydrate that can be absorbed by active transport across the intestinal epithelium.e. Cellulose from plants is a polymer of glucose that can be easily digested and absorbed by the human GI tract.