04:36Learn about the small intestine | Bile juice | Pancreatic juice | Intestinal juiceMercy Education media950views
03:08Chemical and Mechanical Digestion - More Science on the Learning Videos ChannelHarmony Square1633views
Multiple ChoiceAnimals need two types of organic precursors from their food, __________, to serve as the raw materials for the synthesis of larger organic molecules. 734views2rank
Multiple ChoiceA breakfast cereal advertises that it contains essential vitamins and minerals. In this context, the word essential means __________. 835views
Multiple ChoiceWhich of the following are considered essential nutrients: (1) certain carbohydrates, (2) certain fatty acids, (3) certain amino acids, and/or (4) cholesterol? 1544views
Multiple ChoiceB vitamins should be consumed daily, but vitamin A can be consumed more sporadically. Why is this true? 746views1rank
Multiple Choice__________ are needed in the diet as components of teeth and bone, as parts of certain enzymes, for normal muscle and nerve function, and for water balance. 812views
Multiple ChoiceAn insufficient supply of chemical energy in the diet or a shortage of one or more essential nutrients results in which of the following? 531views
Multiple ChoiceDespite long days grazing on tall grasses, several of the cattle released into a new pasture have oddly shaped or broken legs and often lie down. These cattle might be suffering from __________. 544views
Multiple ChoiceWhich of the following animals has a gastrovascular cavity with a single opening? 845views
Multiple ChoiceIn vertebrates, food is moved along the length of the digestive system by __________. 889views
Multiple ChoiceChemical digestion of carbohydrates begins in the __________ with the action of __________. 1222views
Multiple ChoiceHow is the stomach lining protected from the strongly acidic pH of its contents? 1955views1rank
Multiple ChoiceThe liver and pancreas add their secretions to the partially digested food produced in the stomach, in the __________ of the small intestine. 848views
Multiple ChoiceThe natural antacid that protects the intestines against stomach acid is produced by the __________. 680views
Multiple ChoiceWhich of the following processes, structures, or conditions are properly matched? 475views
Multiple ChoicePepsin is an enzyme produced in the stomach that attacks proteins to break them down into smaller peptide molecules. Which of the following statements about this enzyme is true? 2830views
Multiple ChoiceThe lungs consist of many small air sacs and blood vessels, which greatly increase surface area and improve the transfer of substances through their walls. The structures in the digestive system most similar in function to these air sacs and capillaries are the __________. 835views
Multiple ChoiceGallstone surgery sometimes requires that the gallbladder be removed. Patients are then advised to avoid ingesting large amounts of fat because __________. 857views
Multiple ChoiceWhich of the following animals rely on symbiotic relationships with bacteria to obtain nutrients? 497views
Multiple ChoiceHow would you expect the digestive system of a hawk to compare with that of a seed-eating sparrow? 864views
Multiple ChoiceResearchers provided radioactively labeled food to a dog and traced the movement of absorbed molecules. Which type of molecule moved along a path different from all the others? 465views
Multiple ChoiceDuring some types of antibiotic treatments, patients often experience diarrhea because __________. 483views
Multiple ChoiceSymbiotic bacteria living in our large intestines provide us with __________. 769views
Multiple ChoiceWhat relation do indigestible plant fibers, prokaryotes, and vitamins have with the digestive system? 734views
Textbook QuestionLabel the parts of the human digestive system below and indicate the functions of these organs and glands. a. b. c. d. e. f. g. h. i. j. k. l. 2071views
Textbook QuestionThere are several key concepts introduced in this chapter: Structure correlates with function; an animal's body has a hierarchy of organization with emergent properties at each level; and complex bodies have structural adaptations that increase surface area for exchange. Label the tissue layers shown in this section of the small intestine, and describe how this diagram illustrates these three concepts.. a. Microvilli b. Mucosa c. Muscularis d. Sub-serous layer e. Serosa444views
Textbook QuestionWhat is a plasmid? a. an organelle found in many bacteria and certain eukaryotes b. a circular DNA molecule that replicates independently of the main chromosome(s) c. a type of virus that has a DNA genome and infects certain types of human cells, including lung and respiratory tract tissue d. a type of virus that has an RNA genome, codes for reverse transcriptase, and inserts a cDNA copy of its genome into cells819views
Textbook QuestionComplete the following map summarizing the nutritional needs of animals that are met by a healthy diet. a. b. c. d. e. f. g. 519views
Textbook QuestionIn which organ does almost all enzymatic digestion of food occur? (A) stomach (B) small intestine (C) large intestine (D) pancreas1607views
Textbook QuestionWhich 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 production2671views
Textbook QuestionEarthworms, which are substrate feeders. feed mostly on mineral substrates. filter small organisms from the soil. are bulk feeders that ingest large pieces of food. eat their way through the soil, feeding on partially decayed organic matter.1247views
Textbook QuestionIn which digestive system organ does nearly all nutrient absorption occur? (A) stomach (B) small intestine (C) large intestine (D) pancreas1933views
Textbook QuestionWhich of the following is not a major activity of the stomach? a. storage b. HCl production c. nutrient absorption d. enzyme secretion1069views
Textbook QuestionThe energy content of fats a. is released by bile salts. b. is, per gram, twice that of carbohydrates or proteins. c. cannot be dissolved in water and so cannot be absorbed. d. is usually healthier than the energy content of carbohydrates.682views
Textbook QuestionWhich of the following vitamins is mismatched with the disease that results from its underconsumption? a. vitamin B6—beriberi b. vitamin C—scurvy c. vitamin A—vision loss d. vitamin D—rickets466views
Textbook QuestionWhich of the following statements is false? a. A healthy human has enough stored fat to supply calories for several weeks. b. An increase in leptin levels leads to an increase in appetite and weight gain. c. The interconversion of glucose and glycogen takes place in the liver. d. After glycogen stores are filled, excessive calories are stored as fat, regardless of their original food source482views
Textbook QuestionWhy is it necessary for healthy vegetarians to combine different plant foods or eat some eggs or milk products? a. to make sure they obtain sufficient calories b. to provide sufficient vitamins c. to make sure they ingest all essential fatty acids d. to provide all essential amino acids for protein synthesis656views
Textbook QuestionA peanut butter and jelly sandwich contains carbohydrates, proteins, and fats. Describe what happens to the sandwich when you eat it. Discuss ingestion, digestion, absorption, and elimination.774views
Textbook QuestionUse the Nutrition Facts label to the right to answer these questions: Each gram of fat supplies 9 Calories. Based on the grams of saturated fat and its % Daily Value, calculate the upper limit of saturated fat (in grams and Calories) that an individual on a 2,000-Calorie/day diet should consume.538views
Textbook QuestionUse the Nutrition Facts label to the right to answer these questions: Is this product a good source of vitamin D and calcium? Explain.404views
Textbook QuestionUse the Nutrition Facts label to the right to answer these questions: What percentage of the recommended daily value of fat is found in a 1-cup serving?444views
Textbook QuestionHow might our craving for fatty foods, which is helping to fuel the obesity crisis, have evolved through natural selection?507views
Textbook QuestionOne common piece of dieting advice is to replace energy-dense food with nutrient-dense food. What does this mean?410views
Textbook QuestionThe media report numerous claims and counterclaims about the benefits and dangers of certain foods, dietary supplements, and diets. Have you modified your eating habits on the basis of nutritional information disseminated by the media? Why or why not? How should we evaluate whether such nutritional claims are valid?403views
Textbook QuestionIt is estimated that 15% of Americans do not always have access to enough food. Worldwide, more than 1 billion people go to bed hungry most nights, and millions of people have starved to death in recent decades. In some cases, war, poor crop yields, and disease epidemics strip people of food. Many say instead that it is not inadequate food production but unequal food distribution that causes food shortages. What responsibility do nations have for feeding their citizens? For feeding the people of other countries? What do you think you can do to lessen world hunger?397views
Textbook QuestionSCIENTIFIC THINKING Consider the relationship between correlation and causation with respect to some pairs of human traits. For example, are freckles and red hair correlated? Is there causation? How does this concept relate to the study of human nutrition? Can you name examples of correlation in humans with respect to obesity? Explain each answer.489views
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