The upper chambers of the heart are called ventricles.

The two lower chambers of the heart are called ..........

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 ______

All the four chambers of heart are in a relaxed state during

The lower chambers of the heart pump the blood out of the heart.

The number of chambers in the heart of cockroach is

Which of the following chambers of the heart has the thickest muscular wall ?

Assertion : In fishes single circulation occur Reason : Fishes have a 2-chambered hearts with an atrium and a ventricle.

Four chambered heart is present in

Number of chambers in the heart of cockroach :

What is the number of chambers in the heart of periplaneta americana ?