Which wave in an electrocardiogram represents depolarization of the atria? a- R
ID: 3513130 • Letter: W
Question
Which wave in an electrocardiogram represents depolarization of the atria?
a- R wave
B- T wave
C- S wave
D- P wave
E- Q wave
Which statement is CORRECT regarding phase 1 of membrane action potential of the contraction or cardiomyocytes cells in the heart?
A- The voltage-gated K+ channels are open
B- The L-type voltage-gated Ca++ channels are open
C- The transient K+ channels are open
D- The membrane potential does not change
This is a network of specialized cardiac muscle fibers that provide a path for each cycle of cardiac excitation to progress through the heart.
A- Systemic circuit
B- Intercalated discs
C- Cardiovascular center
D- Cardiac conduction system
E- Pulmonary circuit
Which of the following structures allows blood to pass from the right atrium to the right ventricle?
A- Bicuspid valve
B— Interventricular septum
C- Tricuspid valve
D- Mitral valve
E- Ascending aorta
Contraction of the ventricles of the heart leads to blood moving directly_________
A- Into arteries.
B- Into capillaries.
C- Into veins.
D- Through an atrioventricular valve.
Blood leaving the left ventricle passes through which of the following structures?
A- Right atrium
B- Bicuspid valve
C- Aortic semilunar valve
D- Pulmonary semilunar valve
In which period during a cardiac cycle contraction of a chamber occurs and pressure within the chamber rises?
A- filling
B- systole
C- repolarization
D-diastole
E- fibrillation
Which of the following chambers of the heart is surrounded by the thickest layer of myocardium?
A- right atrium
B- left atrium
C- right ventricle
D- left ventricle
Which structure in the heart initiates action potentials that stimulate contraction of the heart at a constant rate ?
A- Cardiac accelerator nerves
B- Atrioventricular node
C- Cardiovascular center
D- Sinoatrial node
E- Bundle of His
Which layer of the heart wall consists of cardiac muscle tissue?
A- Epicardium
B- Pericardium
C- Myocardium
D- Endocardium
Explanation / Answer
Answer: P wave.
2. Which statement is CORRECT regarding phase 1 of membrane action potential of the contraction or cardiomyocytes cells in the heart?
Answer: B- The L-type voltage-gated Ca++ channels are open
3. This is a network of specialized cardiac muscle fibers that provide a path for each cycle of cardiac excitation to progress through the heart.
Answer: Intercalated discs.
4. Which of the following structures allows blood to pass from the right atrium to the right ventricle?
Answer: Tricuspid valve.
5. Contraction of the ventricles of the heart leads to blood moving directly-----
Answer: Into arteries.
From ventricles, the blood is transported to different parts of body through arteries.
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