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UNC-Chapel Hill BIOL 252 - Homework 5 KEY

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Homework 5 (Lessons 12-14) Q1. If the length of the absolute refractory period in cardiac muscle cells were the same as it is for skeletal muscle cells, it would take much longer before cardiac cells could respond to a second stimulation ( ) True (X) False Q2. Which of the following would NOT provide a benefit to a person suffering from any form of anemia? ( ) Injection with synthetic erythropoietin (X) Injection with synthetic bilirubin ( ) Blood transfusion ( ) Supplemental oxygen delivered by a mask Q3. The long plateau phase of the cardiac muscle action potential is due to: ( ) Influx of Na+ ions into the sarcoplasm ( ) Influx of Ca2+ ions into the sarcoplasm ( ) Efflux of K+ into the extracellular matrix (X) Bidirectional movement of Ca2+ and K+ across the sarcolemma Q4. What is the sequence in which blood flows through the cardiovascular circuit? 1. Blood flows through the aortic valve 2. Blood flows through the mitral valve 3. Blood flows through the pulmonary valve 4. Blood flows through the tricuspid valve 5. Blood becomes oxygenated in the pulmonary circuit 6. Blood becomes deoxygenated in the systemic circuit ( ) 3, 4, 5, 2, 1, 6 ( ) 2, 4, 5, 3, 1, 6 (X) 4, 3, 5, 2, 1, 6 ( ) 2, 3, 5, 1, 4, 6 Q5. Which part of the electrocardiogram (ECG) would be affected the most by abnormally slow depolarization of the ventricles? ( ) P wave (X) QRS wave ( ) T wave ( ) R-T intervalQ6. What would be the impact if the connection between the sinoatrial (SA) node and atrioventricular (AV) node becomes damaged? ( ) The ventricles will contract more quickly (X) The ventricles will contract more slowly ( ) The ventricular rhythm will not change ( ) The atria will contract more forcefully Q7. Referring to the ECG below, which location(s) best represents blood entering the systemic circuit? (Select all that apply; no partial credit) [ ] A [ ] B [X] C [X] D [ ] E Q8. Veins carry blood to the heart; arteries carry blood away from the heart. (X) True ( ) False Q9. Which of the following statements about red blood cells are TRUE? (Select all that apply) [x] Mature red blood cells are anuclear and lack most other cellular organelles [x] Erythropoietin, the major hormone involved in erythropoiesis, is produced in the kidney [x] The component of blood that consists of red blood cells is called the hematocrit [ ] The spleen is the location of both erythropoiesis and destruction of old red blood cellsQ10. How many of the following are formed elements in the blood? - Red blood cells - Thrombocytes - Albumin - Immunoglobulins - Tissue factor - Neutrophil ( ) 0 of the above are formed elements ( ) 1 of the above is a formed elements ( ) 2 of the above are formed elements (x) 3 of the above are formed elements ( ) 4 of the above are formed elements ( ) 5 of the above are formed elements ( ) 6 of the above are formed elements Q11. In the blood, you happen to find a small membrane enclosed cell-“like” structure that is devoid of a nucleus, but contains granules, mitochondria, and actin and cytoskeletal proteins. This is a megakaryocyte. ( ) True (X) False Q12. A venom of certain snakes contains substances that activate factors V, IV, and X. Which of the following effects would occur if exposed to human blood? (X) Venom would increase coagulation ( ) Venom would decrease thrombolysis ( ) Venom would increase platelet plug formation ( ) All of the above Q13. You work in an emergency room and have just been assigned a patient who has been in a very severe car accident, causing massive blood loss. You need to give them a blood transfusion. You determine that they are type A- blood. Which blood type may be acceptable for your patient to receive? ( ) AB- ( ) O+ ( ) A+ (x) None of the aboveQ14. Both the extrinsic and intrinsic coagulation pathways end with activation of factor X. (X) True ( ) False Q15. You add an anti-A antigen antibody to a blood sample and observe no agglutination or lysis. It is therefore possible that the patient that the blood sample was taken from is blood type AB-. ( ) True (X)


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