Dur plex of the ECG C. isovolumetric contraction. D. ventricular filling. 9 What

Question

Dur plex of the ECG C. isovolumetric contraction. D. ventricular filling. 9 What step of the cardiac cycle will start during the QRS com A. isovolumetric relaxation. B. ventricular diastole. 10. For a B cell to become active, a. eytotoxic T cells must bind to the MHC complex on the B cell. B. plasma cells must differentiate into B cells C cytokines (local hormones) are released from helper T cells to initiate the process. memory B cells have to bind with suppressor T cells to differentiate into activated B D. cells 11. Increased osygen consumption by muscle fibers would accompany all of the following EXCEPT A. increased acrobic respiration. B. increased muscle activity C. decreased ATP use. D. increased heat production. 12. When a person with Type B blood is infused with Type O blood. A. the anti-B antibodies in the Type O blood will cause a massive agglutination B, the anti-A antibodies in the Type B blood will react with the antibodies in the Type O blood C. the anti-O antibodies in the Type B blood will react with the surface antigens of the Type O blood. D. no adverse reaction will occur. 13. After getting a small cut on your finger, you would probably experience B. leukocytosis C. leukemia. D. anemia. 14. Internal respiration A. refers to gas exchange between alveoli and blood in pulmonary capillaries B. will only occur if the partial pressure of oxygen in the blood is low C. cannot happen if compliance is decreased. D. occurs between blood and tissue beds throughout the body. 15. Which part of the sarcomere is where actin and myosin interact? A. Z line. B. Zone of overlap. C. I band. D. H zone. 16. A motor neuron becomes activated. This information must reach the muscle fiber by way of the A. junctional folds. B. neuromuscular junction. C. sarcolemma. D. mitochondria. 2

Explanation / Answer

9. Qrs complex corresponds to the contraction of the ventricles. Thus the correct answer is isovolumetric contraction.

10. Cytokines released from T helpers cells help in the process of activation of the B cells

11. Cellular respiration is the process where oxygen is used to produce ATP and heat. this process necessarily doesn't translate into muscular activity. Thus an increased oxygen consumption doesn't mean increased muscle activity.

12. The anti B antibodies in the type O blood will cause massive agglutination. type O blood has neither A nor B antigen and thus by rule has both the antibodies present the Sera

13. Loss of blood causes anemia as loss of RBCs means loss of hemoglobin

14. Refers to gas exchange between the alveoli and pulmonary capillaries

15. H zone

16. Neuromuscular junction

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