An artificial pacemaker is implanted subcutaneously and connected to the heart in patients:

When the heart of a frog is removed from the body,it continues to beat for some time. Select the correct statement$(s)$ from the following:
$(i)$ The frog is a cold-blooded animal.
$(ii)$ The frog does not have a heart-based circulatory system.
$(iii)$ The heart has myogenic properties.
$(iv)$ The heart is self-excitable.

In humans,the sinus venosus is considered to have merged with the wall of which chamber?

What is the heart rate of children compared to adults?

Differentiate between: Tricuspid and bicuspid valve.

The His bundle is a network of .........