Hṛdaya (हृदय) means heart, and kriyā (क्रिया) means activity.
However, depending on the context, you might also use other Marathi terms for cardiac activity like:
* हृदय क्रियाकलाप (hṛday kriyakalāp) - This is a more formal and technical term.
* हृदयाचा ठोठाव (hṛdayācā ṭhoṭhāv) - This literally means "the beat of the heart," and is often used in a more informal setting.
It's important to consider the context when choosing the most appropriate translation.