
54-Year-Old Female with a Defective Heart Valve
Dr. El-Sheikh is a 54-year-old Egyptian female who complains of weakness, fatigue, shortness of breath, chest pain, and dizziness. Her heart rate is 96 beats/min, and her blood pressure is 148/54 mm Hg. You notice that she nods her head with every heartbeat, and her radial pulse is very strong and abrupt. Her heart sounds are abnormal, with a long diastolic murmur at the right sternal margin in the second intercostal space.
Her doctor orders an echocardiogram, which shows that Dr. El-Sheikh has severe aortic regurgitation (backflow of blood through an incompetent valve) and an enlarged left ventricle.
1. Why does an incompetent aortic valve cause a diastolic murmur?

Want to see the full answer?
Check out a sample textbook solution
Chapter 18 Solutions
Human Anatomy & Physiology Plus Modified Mastering A&P with Pearson eText -- Access Card Package 11th edition
- Describe the levels of structural hierarchy for the human body, starting with the organismal level and ending with the chemical level. In addition, you should make sure you link each level to the previous level, emphasizing the structural relationships.arrow_forward9 S es Read the section "Investigating Life: In (Extremely) Cold Blood." Then, drag and drop the terms on the left to complete the concept map. Red blood cells Genes Icefishes -have mutated have colorless Oxygen have few lack encode Blood Cellular respiration consists of- contain carries is a Platelets White blood cells carries low amounts of Hemoglobin is necessary for Plasma Protein Reset.arrow_forwardPlating 50 microliters of a sample diluted by a factor of 10-6 produced 91 colonies. What was the originalcell density (CFU/ml) in the sample?arrow_forward
- Every tutor here has got this wrong, don't copy off them.arrow_forwardSuppose that the population from question #1 (data is in table below) is experiencing inbreeding depression (F=.25) (and no longer experiencing natural selection). Calculate the new expected genotype frequencies (f) in this population after one round of inbreeding. Please round to 3 decimal places. Genotype Adh Adh Number of Flies 595 Adh Adh 310 Adhs Adhs 95 Total 1000 fladh Adh- flAdn Adh fAdhs Adharrow_forwardWhich of the following best describes why it is difficult to develop antiviral drugs? Explain why. A. antiviral drugs are very difficult to develop andhave no side effects B. viruses are difficult to target because they usethe host cell’s enzymes and ribosomes tometabolize and replicate C. viruses are too small to be targeted by drugs D. viral infections usually clear up on their ownwith no problemsarrow_forward
- This question has 3 parts (A, B, & C), and is under the subject of Nutrition. Thank you!arrow_forwardThey got this question wrong the 2 previous times I uploaded it here, please make sure it's correvct this time.arrow_forwardThis question has multiple parts (A, B & C), and under the subject of Nutrition. Thank you!arrow_forward
- Calculate the CFU/ml of a urine sample if 138 E. coli colonies were counted on a Nutrient Agar Plate when0.5 mls were plated on the NA plate from a 10-9 dilution tube. You must highlight and express your answerin scientific notatioarrow_forwardDon't copy off the other answer if there is anyarrow_forwardAnswerarrow_forward
- Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
- Medical Terminology for Health Professions, Spira...Health & NutritionISBN:9781305634350Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. SchroederPublisher:Cengage LearningUnderstanding Health Insurance: A Guide to Billin...Health & NutritionISBN:9781337679480Author:GREENPublisher:Cengage

