Food going through the human digestive system only moves in one direction in some animals however their food and their waste go into and come out of the same opening in what animals does this happen and why?
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- Figure 34.19 Which of the following statements about digestive processes is true? Amylase, maltaseT and lactase in the mouth digest carbohydrates. Trypsin and lipase in the stomach digest protein. Bile emulsifies lipids in the small intestine. No food is absorbed until the small intestine.Figure 16.7 Which of the following statements about the digestive system is false? a. Chyme is a mixture of food and digestive juices that is produced in the stomach. b. Food enters the large intestine before the small intestine. c. In the small intestine, chyme mixes with bile, which emulsifies fats. d. The stomach is separated from the small intestine by the pyloric sphincter.Figure 34.11 Which of the following statements about the digestive system is false? Chyme is a mixture of food and digestive juices that is produced in the stomach. Food enters the large intestine before the small intestine. In the small intestine, chyme mixes with bile, which emulsifies fats. The stomach is separated from the small intestine by the pylloric sphincter.
- Digestion in humans and earthworms O is similar in that in both organisms, digestion occurs in a simple tract, in which all parts of the tract are similar. O is similar in that in both organisms, digestion is an intracellular process, occurring in an incomplete digestive system. O is different in that digestion is an extracellular process in humans but an intracellular process in earthworms. O is different in that earthworms have a sac plan body plan and humans have a tube- within-a-tube body plan. O is similar in that in both organisms, digestion is an extracellular process, occurring in a complete digestive tract.The stomach has two types of exocrine secretory cells: chief cells that secrete an inactive form of a protein-digesting enzyme, pepsinogen parietal cells that secrete hydrochloric acid (HCl), which activates pepsinogen Both these cell types have an abundance of mitochondria for ATP production - the chief cells for the energy needed needed to synthesize pepsinogen, the parietal cells for the energy needed to transport H+ and Cl- from the blood into the stomach lumen. But only one of these cell types also has an extensive rough endoplasmic reticulum and abundant Golgi stacks. Explain which cell type would have extensive rough ER and Golgi stacks and why. Also explain which cell type would not have as extensive a rough ER and Golgi stacks and why.During digestion we produce energy by converting large complex molecules into smaller simpler molecules. During this process what best describes the changes in energy? 1. Stays the same 2. Increases 3. Decreases 4. Increases then decreases
- Many digestive enzymes are synthesized in the pancreas and released into the duodenum. Why do mammalian digestive systems go to the trouble of producing pepsin in the stomach? What does pepsin do that others do not?Which of the following structures produces digestive enzymes? the liver the small intestine the endocrine pancreas the gallbladder all of these produce digestive enzymesBoth the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules. Which statement best describes changes to food during digestion? O The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes. O The muscle contractions and the action of the peptidase both result only in physical changes. O The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes. O The muscle contractions and the action of the peptidase both result only in chemical changes. 8. 9. 10 11 12 13 14 15 16 17 20 近
- Follow the route food takes in the human GI tract and know the organs and their key functions including key fluids that are secreted. What actually does the stomach in humans do? (it is NOT the main place of digestion). What is bile (not a digestive enzyme) and where made, where secreted? What does pancreas contribute? Where is most of the food actually broken down into smaller molecular parts = digested? What is major role of large intestine (not digestion, not most absorption of nutrients) What are the muscular contractions that move it all?Which of the following is true of an incomplete digestive tract? Food moves in one direction as it is processed. Both a mouth and anus are present. It can be specialized for digestion in different groups of animals based on diet. A single opening functions in ingestion and eliminaton.Drag and drop each item to the correct type of animal. Birds May regurgitate undigested food in pellets Must digest cellulose but lack the enzyme to do so May ingest stones to grind food Lack teeth Bacteria in the gut digest cellulose Some possess a muscular gizzard Have three outpouchings of the esophagus Have a complex stomach Possess a glandular proventriculus as the first part of the stomach Stomach has one chamber Ruminants Nonruminants
