Question

What part of the heart contracts first in the cardiac cycle?

Answer 1

The atriums contract first in cardiac cycle..

Answer 2

$\huge{Hey Mate!!!}$

☆☞ Here is ur answer ☜☆

✔✔ ATRIUMS CONTRACT FIRST ✔✔

✔✔ At the "Start" of the cycle, during ventricular diastole–early,

✔✔ The heart relaxes and expands while receiving blood into both ventricles through both atria;

✔✔ Then, near the end of ventricular diastole–late,

✔✔ The two atria begin to contract (atrial systole), and each atrium pumps blood into the ventricle 'below' it.

HOPE IT HELPS!