{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

NPB 101 Summer '09 Midterm 2

NPB 101 Summer '09 Midterm 2 - Print Name Test From A...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Print Name: ________________________________ Test From: A 1 NPB101Sum09-MT2 Scantron: 1. Clearly Print your Name 2. Subject: 101Sum09-MT2 3. Test No: MT2 4. Date: 7-20-09 5. Bubble in your UCD ID# and Write each digit at the top of its column 6. Bubble in your Test Form. Turn in your Scantron. You may keep your copy of the examination. Multiple Choice/ True-False Identify the choice the answer that best completes the statement or answers the question. ____ 1. Which of the following Statements is/are correct regarding ion channel activation during the upstroke, Phase 0, of the Purkinje Fiber action potential? Statement #1: Inward current is carried through Ca channels and fast Na channels. Statement #2: There are more K channels activated than during the resting membrane potential. Statement #3: Phase 0 is terminated with inactivation of the fast Na channels and all the Ca channels. a. All three Statements are true. d. Only Statements #1 and #2 are true. b. All three Statements are false. e. Only Statements #1 and 3 are true. c. Only Statement #1 is true. ____ 2. Condition: A cardiac cell membrane potential is not changing over time, ie. the membrane potential is flat. There is an intervention, and you observe an increase in both inward and outward + current flow with outward current flow much greater than the inward current flow. As the consequence of these change in current flow, Statement: you would observe a shift in the membrane potential to a less positve, or negative membrane potential. a. True b. False
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Test Form: A 2 ____ 3. Which of the following conditions will shorten the time for cell to cell spread of activation in cardiac tissue? Statement #1: Increasing the conductivity of through the connexons in the gap junctions. Statement #2: Stimulating the tissue earlier rather than later in its relative refractory period. Statement #3: Stimulating the tissue later rather than earlier in its relative refractory period. ____ 4. The funny Na channel Statement #1: is activated during depolarization. Statement #2: is activated during repolarization. Statement #3: generates the inward current flow responsible for the pacemaker potential. ____
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern