Multiple Choice QuestionsWhich of the following layer of heart wall consists of cardiac muscles ?
Endocardium
Myocardium
Epicardium
All of these
If heart beats 75 beats/min. then what is time for cardiac cycle ?
0.5 sec
0.8 sec
1 sec
1.5 sec
B.
0.8 sec
In human beings, the cardiac cycle takes about 0.8 second.
The time for auricular systole is 0.1 second and that for auricular diastole is 0.7 second. Ventricular systole, which consists of the compression period (0.1 sec) and the expression period (0.2 second) takes 0.3 second and ventricular diastole takes 0.5 second. Hence, the total systole occupies 0.4 second and joint diastole 0.4 second.
Therefore, if heart beats 75 beats/min, then the time for one complete cardiac cycle is 0.8 sec.
Blood pressure increases and heart rate decreases in response to :
exercise
haemorrhage
exposure to high altitude
increased intracranial pressure
'P' wave of ECG occurs before the:
onset of ventricular ejection
end of atrial contraction
begining of atrial contraction
none of the above
Which of the following is the character of the bile juice?
It has trypsin
It has no enzyme
It has enterogasterone
It has tripophnomide
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