In which of the following, heart pump mixed blood

Which of the following parts of heart pumps blood to lungs?

In which of the following group heart does not pump oxygenated blood to different parts of the body?

In which of the following vertebrate group/groups,heart does not pump oxygenated blood to different parts of the body ?

In which of the following vertebrate group/groups,heart does not pump oxygenated blood to different parts of the body ?

The lower chambers of the heart pump the blood out of the heart.

(a) What are the upper parts of the heart called ? (b) What are the lower parts of the heart called ? (c) What is the name of blood vessels which connect arteries to veins ? (d) (i) Which side of the heart pumps blood into the lungs ? (ii) Which side of the heart pumps blood into entire body (except the lungs ) ?

Give the causes of the following : (a) Heart sounds (b) Non-mixing of deoxygenated and oxygenated blood in the mammalian heart.