B) P wave. 5 C) S wave. D) PR complex. E) QRS complex 97) In t 26) The second he
ID: 3484247 • Letter: B
Question
B) P wave. 5 C) S wave. D) PR complex. E) QRS complex 97) In t 26) The second heart sound is heard when A) the AV valves close. B) the D) the AV valves open. E) the atria contract 98) Dur 27) Relaxation of the ventricles is called C) h Dj ventricular diastole. E) none of the above 9) The 28) The P wave of the ECG corresponds to A) ventricular diastole. lar systole. E) none of the above Th 29) Select the correct order of stimulation in the nodal pathways. A) AV node, SA node, AV bundle, Purkinje fibers B) Purkinje fibers, SA node, AV node, AV bundle C) SA node, AV bundle, AV node, Purkinje fibers D) SA node, AV node, AV bundle, Purkinje fibers E) none of the above 30) Cardiac muscle is similar to skeletal muscle in A) the arrangement of the sarcoplasmic reticulum. B) the presence of stria C) the presence of intercalated discs. D) the arrangement of the t-tubules. E) all of the above 31) The cardiac output is equal to A) the product of heart rate and blood pressure. B) the difference C) the product of heart rate and stroke volume. D) the difference between the stroke volume at rest and the stroke volume during exercise. E) the stroke volume less the systolic volume n the diastolic volume and the systolic volume. 32) The blood vessels that play the most important role in the regulation of blood flow and blood pressure are the A) veins. C) capillaries. D) venules E) arteries.Explanation / Answer
25.E
The depolarisation of the ventricle is associated with the QRS wave of the ECG. THis leads to the contraction of the ventricles and pumping of the blood into the large arteries.
26. B
The second sound DUB, is caused by closing of semilunar valve, and the first sound LUB is due to closing of atrioventricular valves.
27. D Ventricular diastole.
28. B.
atrial depolarization. It represents right and left atrial depolarization.
29. D.
30. B
both cardiac and skeletal have striated muscles.
31. C.
It depends on the the amount of blood pumped from a ventricle in a single heartbeat and the toal number of heart beats in a minute.
32. B. arterioles.
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