Question

1) the cardiac cycle starts at the ______ age of embryo.
2)the four chambers of _____,______,_____,&_____
3)the first step of cardiac cycle is ________
4)_______ blood is carried to the right atrium.
5)left auricle is filled with ______ blood.​

Answer 1

Explanation:

1) 3 week

2)Left auricle , right auricle, Left ventricle and right ventricle.

3)Atrial contraction.

4)deoxygenated blood.

5)Oxygenated blood

Hope it will help you.

please mark me as brainliest answer.