The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from

Mammalian heart is myogenic and regulated by specialized nodal tissue. Where does the cardiac impulse originate?

Which one of the following hormones increases the heartbeat in mammals?

A carcinoma is a cancer originating from -

Which of the following roles is/are played by epididymis, vas deferens, seminal vesicles and prostate in male reproductive system of human?

The elemental composition of an adult human body by mass is