#1
Which of the following waves on an electrocardiogram represents ventricular depolarization?
QRS complex
ExplanationQRS complex represents ventricular depolarization.
#2
What does the T wave on an electrocardiogram represent?
Ventricular repolarization
ExplanationT wave represents ventricular repolarization.
#3
Which of the following lung volumes represents the volume of air inspired or expired during normal breathing?
Tidal volume (TV)
ExplanationTV is the volume of air inspired/expired during normal breathing.
#4
Which of the following pulmonary function tests measures the volume of air inspired or expired forcefully in the first second?
Forced expiratory volume in 1 second (FEV1)
ExplanationFEV1 measures forcefully exhaled air volume in the first second.
#5
Which of the following pulmonary function tests measures the amount of air forcefully exhaled in one breath after a deep inhalation?
Forced vital capacity (FVC)
ExplanationFVC measures forcefully exhaled air after deep inhalation.
#6
Which of the following lung volumes represents the volume of air remaining in the lungs after a maximal expiration?
Residual volume (RV)
ExplanationRV is the volume of air in the lungs after maximal expiration.
#7
Which of the following pulmonary function tests measures the maximum amount of air a person can exhale after a maximum inhalation?
Forced vital capacity (FVC)
ExplanationFVC measures max air exhaled after maximal inhalation.
#8
In electrocardiography, what does a prolonged PR interval indicate?
Delayed conduction through the AV node
ExplanationProlonged PR interval indicates delayed AV node conduction.
#9
Which of the following pulmonary function tests measures the rate at which air can be exhaled forcefully after a maximal inhalation?
Forced expiratory volume in 1 second (FEV1)
ExplanationFEV1 measures rate of forcefully exhaled air after maximal inhalation.
#10
Which of the following represents the correct order of electrical conduction in the heart?
SA node - AV node - Bundle of His - Purkinje fibers
ExplanationOrder of heart conduction: SA node - AV node - Bundle of His - Purkinje fibers.
#11
What is the normal range for the PR interval in an electrocardiogram?
0.04 to 0.12 seconds
ExplanationNormal PR interval range is 0.04 to 0.12 seconds.
#12
What is the purpose of the QRS complex on an electrocardiogram?
Ventricular depolarization
ExplanationQRS complex purpose is ventricular depolarization.
#13
What is the purpose of the U wave on an electrocardiogram?
Ventricular repolarization
ExplanationU wave purpose is ventricular repolarization.
#14
What does the Q wave on an electrocardiogram represent?
Ventricular depolarization
ExplanationQ wave represents ventricular depolarization.
#15
What does the ST segment represent on an electrocardiogram?
Isoelectric period between ventricular depolarization and repolarization
ExplanationST segment is the isoelectric period between ventricular depolarization and repolarization.
#16
What does the J point represent on an electrocardiogram?
Isoelectric period between ventricular depolarization and repolarization
ExplanationJ point is the isoelectric period between ventricular depolarization and repolarization.
#17
What is the primary function of the Bundle of His in the heart's electrical conduction system?
Conducting electrical signals from the AV node to the Purkinje fibers
ExplanationBundle of His conducts signals from AV node to Purkinje fibers.