a. Amphibians and reptiles have a 3 chambered heart with ___ atria and ___ventricle.
b. Heart is ___ derived organ and protected by a double walled membranous bag called ____
c. The opening between right Atrium and Right ventricle is guarded by a valve formed of ___ muscular flaps, the ___ valve.
d. The wall of ventricle is ____ than atria.
e. SAN can generate the maximum number of action potential i.e., ____ `mi n^(-1)`. therefore it is called _____
f. Atrial systole increases the flow of blood into the ventricles by about ____ percent.
g. In ____ all the four chambers of the heart are in a relax state.
h. The ____ wave represents the depolarisation of the atria.
i. A system of blood vessels is present in our body exclusively for the circulation of blood to and from the cardiac musculature called _____
j. PNA ____ the rate of heart beat and ______

Answer

a. 2,1
b. Mesodermal,Pericardium
c. 3,Tricuspid
d. Thicker.
e. 72, Pacemaker
f. 30%
g. Joint diastole
h. P
i. Coronary
j. Decrease, Cardiac output