Skip to Main Content
Home Books Ganong’s Review of Medical Physiology, 25e

SECTION V: CARDIOVASCULAR PHYSIOLOGY

  • Sections
  • Print
  • Get Citation

    Citation

    Disclaimer: These citations have been automatically generated based on the information we have and it may not be 100% accurate. Please consult the latest official manual style if you have any questions regarding the format accuracy.

    AMA Citation
    CARDIOVASCULAR PHYSIOLOGY. In: Barrett KE, Barman SM, Boitano S, Brooks HL. Barrett K.E., & Barman S.M., & Boitano S, & Brooks H.L.(Eds.),Eds. Kim E. Barrett, et al.eds. Ganong’s Review of Medical Physiology, 25e. McGraw-Hill; Accessed July 02, 2020. https://accessmedicine.mhmedical.com/content.aspx?bookid=1588&sectionid=105620301
    APA Citation
    Cardiovascular physiology. Barrett KE, Barman SM, Boitano S, Brooks HL. Barrett K.E., & Barman S.M., & Boitano S, & Brooks H.L.(Eds.),Eds. Kim E. Barrett, et al. (2018). Ganong’s Review of Medical Physiology, 25e. McGraw-Hill. https://accessmedicine.mhmedical.com/content.aspx?bookid=1588&sectionid=105620301
    MLA Citation
    "CARDIOVASCULAR PHYSIOLOGY." Ganong’s Review of Medical Physiology, 25e Barrett KE, Barman SM, Boitano S, Brooks HL. Barrett K.E., & Barman S.M., & Boitano S, & Brooks H.L.(Eds.),Eds. Kim E. Barrett, et al. McGraw-Hill, 2018, https://accessmedicine.mhmedical.com/content.aspx?bookid=1588&sectionid=105620301.

    Download citation file:

    RIS (Zotero)
    EndNote
    BibTex
    Medlars
    ProCite
    RefWorks
    Reference Manager
    Mendeley
    © Copyright
  • Tools
  • Search Book
  • Clip
Top

SECTION V. CARDIOVASCULAR PHYSIOLOGY

Which part of the ECG (eg, Figure 29–5) corresponds to ventricular repolarization?

FIGURE 29–5: Waves of the ECG. Standard names for individual waves and segments that make up the ECG are shown. Electrical activity that contributes the observed deflections are discussed in the text and in Table 29–2.

image
View Full Size|Favorite Figure|Download Slide (.ppt)
image

Favorite Table | Download (.pdf) | Print
TABLE 29–2: ECG intervals.
Normal Durations
Intervals Average Range Events in the Heart during Interval
PR intervala 0.18b 0.12–0.20 Atrioventricular conduction
QRS duration 0.08 to 0.10 Ventricular depolarization
QT interval 0.40c to 0.43 Ventricular action potential
ST interval (QT minus QRS) 0.32 … Plateau portion of the ventricular action potential

aMeasured from the beginning of the P wave to the beginning of the QRS complex.

bShortens as heart rate increases from average of 0.18 s at a rate of 70 beats/min to 0.14 s at a rate of 130 beats/min.

cCan be lower (0.35) depending on the heart rate.

A. The P wave

B. The QRS duration

C. The T wave

D. The U wave

E. The PR interval

Which of the following normally has a slowly depolarizing “prepotential”?

A. Sinoatrial node

B. Atrial muscle cells

C. Bundle of His

D. Purkinje fibers

E. Ventricular muscle cells

In second-degree heart block

A. the ventricular rate is lower than the atrial rate.

B. the ventricular ECG complexes are distorted.

C. there is a high incidence of ventricular tachycardia.

D. stroke volume is decreased.

E. cardiac output is increased.

Currents caused by opening of which of the following channels contribute to the repolarization phase of the action potential of ventricular muscle fibers?

A. Na+ channels

B. Cl− channels

C. Ca2+ channels

D. K+ channels

E. HCO3− channels

...

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.

This site uses cookies to provide, maintain and improve your experience. MHE Privacy Center Close