Which of the following layer of heart wall consists of cardiac muscles ?
Endocardium
Myocardium
Epicardium
All of these
B.
Myocardium
The endocardium is a thin layer of endothelium that lines the interior of the chambers of heart. The myocardium is thick middle layer and consists of cardiac muscles. The epicardium is a thin moist layer of epithelium and connective tissue, which is firmly attached to the myocardium.
If heart beats 75 beats/min. then what is time for cardiac cycle ?
0.5 sec
0.8 sec
1 sec
1.5 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