PORTAGE LEARNING A&P I FINAL EXAM WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS ALREADY GRADED A+ GUARANTEED PASS You are observing two cells under the microscope. They are the same type of eukaryotic cell but one appears much larger. Based on appearance alone, which one would you expect to be carrying out respiration at a more active rate, the larger or smaller cell? Explain why. I believe it is the smaller cell that will breathe at a more active rate because in order for respiration to occur efficiently and more actively the surface area to volume ratio is very critical; also, if the larger surface area is present th en the diffusion of gases occur at a higher rate; so, larger cells will have a smaller surface to volume ratio and diffusion that will occur at a slower rate creating a less active respiration; and, on the other hand smaller cells will have a larger surfac e area to volume ratio and an improved diffusion rate, so the higher rate and more active respiration. The smaller cell. Cells need to remain relatively small because as a cell expands the amount of surface area relative to the volume of the cell decreases . The smaller cell is more active because relative to its volume, its surface area is larger than a bigger cell. With a larger surface area (relative to its volume) this allows the metabolic processes to occur faster. Note: Essay answers must clearly be in your own words. Explain what happens to the epiglottis during swallowing. Why? During swallowing the epiglottis moves inferiorly to close off and prevent aspiration by covering the trachea and creating a passage for liquid, food, or bolus into the esophag us; and, preventing these things from entering into the lungs . Air and food pass in which one of the following areas: Oropharynx Label the following five items from the diagram: Label B - ___________ Label D - __________ Label E - __________ Label F - ________ __ Label G - __________ B - Oral Cavity D - Epiglottis E - Glottis F - Trachea G - Esophagus From widest to narrowest, the branches of the bronchial tree are: Primary bronchi, secondary bronchi, tertiary bronchi, bronchioles Explain why someone who has hy pergastrinemia (excessive secretion of gastrin) might develop gastric/stomach ulcers. Hypergastrinemia leads to excess secretion of the gastrin hormone, which induces excess secretion of hydrochloric acid in the stomach; and, the excess acid then acts as a protective mucousa layer causing disruption that can lead to those ulcers. Gastrin stimulates the secretions of pepsinogens and hydrochloric acid. Excess amounts would lead to erosion of the stomach lining. Look carefully at the diagram below. Label the f ollowing 5 organs of the digestive system. To receive credit for the intestines you must label the specific region. 3: ___________ 4: ___________ 7: ___________ 9: ___________ 10: ___________ 3. Stomach 4. Gallbladder 7. Jejunum 9. Appendix 10. Rectum Note: Essay answers must clearly be in your own words. Answer the following essay question: Describe parietal cells and chief cells: name their location, secretions and purposes. Parietal and chief cells are located in the stomach wall and they secrete gastr ic juices and mucous, secrete hormones that regulate digestive activity; also, parietal cells produce HCl in the stomach; and, chief cells secrete te enzymes pepsinogen, rennin, and gastric lipase. The parietal cells (located in the wall of the stomach bod y) secrete hydrochloric acid, generating a pH of 1.3 -3.5. This very acidic pH kills many of the bacteria ingested along with food. In addition, the low pH stops the activity of salivary amylase. The secretion of hydrochloric acid is essential in the activa tion of pepsin. Chief cells: secrete pepsinogen. Pepsinogen (a pre -enzyme) is secreted by the chief cells in the stomach. Hydrochloric acid converts the inactive pepsinogen (secreted by the chief cells) into the active enzyme pepsin which begins the breakd own of proteins. Label the following bones of the skeleton from the figure below: 1: ____________ 3:____________ 5:____________ 7: ____________ 8: ____________ 1: Frontal bone/frontal sinuses 3: Maxilla 5: Vomer 7: Maxilla 8: Mandible Label the bones in the figure below: A: ____________ B: ____________ C: ____________ D: ____________ E: _____________ A. Pisiform B. Hamate C. Capitate D. Trapezoid E. Trapezium A patient has a diagnosis of osteoporosis. (1) In your own words, describe this diagnosis and ( 2) What type of bone cell would they be lacking? Explain your answer. (1) The textbook states that osteoporosis is a bone tissue disease where the bone tissue degenerates faster than it is replaced making the bones weak, causing increased pain, and more li kely to fracture due to them being brittle. (2) Furthermore, there would be a decreased number of osteoblasts, which are responsible for bone repair; also, the bone repair would be unable to keep up with the ongoing breakdown of the bone which is responsib le in the process that included the osteoblasts that take the calcium from the blood. Label the following five muscles: B: _____________ C: _____________ E: _____________ G: _____________ J: ______________ B: Temporalis C: Orbicularis oculi E: Zygomaticus major G: Buccinator J: Depressor labii inferioris
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