MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Which of the fo

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Multiple Choice Choose The One Alternative That Best Completes The Statement Or Answers The Question 1 Which Of The Fo 1 (68.47 KiB) Viewed 48 times

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Which of the following is true regarding the pre-ganglionic and post-ganglionic neurons of the PSNS? 1) A) Both neurons release neurotransmitter from varicosities B) Both neurons release Ach to signal their target cells C) Both neurons originate (have their cell body) in the CNS D) One neuron releases Ach to signal target cells and the other neuron releases norepinephrine 2) Which if the following molecules of the innate immune response act as opsonins, attractants for leukocytes, and ultimately form the membrane attack complex to lyse infected body cells and pathogens? A) Histamine B) Acute-phase proteins C) Interleukins (ILS) D) Complement proteins 3) Ca2+ is regulated via hormones, balancing the ECF concentration between bone, intestine and kidney IF 3) you recall from Chapter 23, reabsorption is driven primarily by PTH. Which portion of the nephron is the most likely site of PTH-driven reabsorption of Ca2+ ? A) ascending loop B) proximal tubule C) distal nephron D) descending loop 4) 4) Which of the following is the best explanation for why cardiac contractile fibers depolarize and contract in a defined pathway, ensuring the complete contraction cycle of the heart? A) The gap junctions at the intercalated discs allow for ion flow to conduct current from one fiber to the next in a defined pathway. B) The SA node delivers the contraction signal to the right atrium, then the left atrium, and then the AV node delivers the contraction signal to the right ventricle and then the left ventricle. C) The flow of blood into each chamber causes first a stretch of the fibers, followed by a reflexive contraction of the fibers, ensuring that the heart continues to contract in the absence of current D) The contraction signal produced by the SNS targets every fiber in a specific sequence 5) 5) What causes the AV node delay represented by the P-R segment on the ECG tracing? A) The internodal pathways feed into the AV node through very indirect routes B) It takes a certain amount of time for the Cat signal to be transferred to atrial contractile cells. C) AV node autorhythmic cells have a higher threshold than SA node autorhythmic cells 6) Which of the following is the driving force for blood pressure, once the left ventricle has contracted? A) smooth muscle contraction in arterioles B) constriction of veins C) capillaries D) elastic recoll in arteries 6)