Contraction

Card Set Information

Author:
DesLee26
ID:
203129
Filename:
Contraction
Updated:
2013-02-24 21:25:55
Tags:
BIO 220 Test Two
Folders:

Description:
Test II
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user DesLee26 on FreezingBlue Flashcards. What would you like to do?


  1. a.      Generally speaking, only nerves can stimulate __ and __
                                                                  i.      The exception is the __

    1.      why?
    • blood vessels and glands
    • cardiac muscle
    • The cells have been modified to do what neurons doa.      Can excite, not only themselves, but the rest of the muscle mass I the heart
  2. What can the atrial mass do?
    can become excited independent of the ventricular mass, and vice versa
  3. Components of the conduction system
    •                                                               i.      SA node (upper right hand corner of atrium)
    •                                                             ii.      Continuous with group of fibers called interatrial fibers, which run through wall of right atrium
    •                                                           iii.      Go to AV node, causing atrium to contract
    •                                                           iv.      During contraction, the excitement runs down the Bundles of His and up the Purkinje fibers, causing the ventricles to contract
  4. What is the conduction system JUST?
    • a.      The conduction system is JUST the movement of the excitation from one component to the next and over the muscle mass
    •                                                               i.      Its exciting the muscle mass; moving the excitation and generating a nerve impulse to excite the atria and then the ventricles
    • 1.      Once they are excited, they contract
  5. a.      When chambers are relaxed, they are not excited= __
    diastole
  6. What is the relaxation phase?
    • chambers are not excited
    • during relaxation, the chambers are fillign
  7. Explain excitement.
    • a.      When the chambers are excited, they are in the contraction phase, called systole
    •                                                               i.      They are emptying when they are contracting
  8. Explain right and left atrial contraction.
    • a.      Right and left atrium contract together, but independent of right and left ventricle
    •                                                               i.      Atrial mass contracts as one; likewise, the ventricular mass contracts as one
  9. What's causing the contraction?
    the conduction system
  10. Contraction cycle steps
    One
    •                                                               i.      There is a period of time when both sets of chambers are filling in the contraction cycle
    • 1.      Time it takes for SA node to get excited
    •                                                             ii.      As excitation passes from SA nodeà interatrial fibersà AV node, the whole atrial mass will contract
  11. When does most ventricular filling occur?
    70% of ventricular filling occurs when both sets of chambers are at diastole (relaxed
  12. True or False: 
    Chambers frequently get devoid of blood
    False:

                                                                  i.      Chambers never get devoid of blood, but most occurs when both sets are relaxed; the other 30% occurs when blood is squeezed out of atria during contraction
  13. At point where atria relax and ventricles contract, what occurs?
    the AV valves close
  14. 1.      VENTRICLES CONTRACT= __ CLOSED, __ARE OPEN
    a.      THE CLOSING OF THE __ IS THE FIRST HEART SOUND
    • AV VALVES
    • SEMILUNAR
    • AV VALVES
  15.                                                               i.      Excitation passes over ventricles and they __
    1.      __ valves close and the __valves open
    a.      THE CLOSING OF THE __IS THE SECOND HEART SOUND
                                                                                                                                          i.      __
                                                                ii.      They are __together, but not __together
    • relax
    • Semilunar
    • AV
    • SEMILUNAR VALVE
    • Lupp-dub
    • filling
    • emptying






























  16. Atrial

    1)

    5)

    8)

    Ventricular

    2)

    9)

    12)

    AV valve

    3)

    6)

    10)

    13)

    Semilunar

    4)

    7)

    11)

    14)
    • 1) Diastole
    • 2) Diastole
    • 3) open
    • 4) closed
    • 5) Systole
    • 6) Open (1stsound)
    • 7) Closed
    • 8) diastole
    • 9) Systole
    • 10) Closed
    • 11) open
    • 12) diastole
    • 13) open
    • 14) closed

What would you like to do?

Home > Flashcards > Print Preview