What is the major part of the body that moves blood?

The circulatory system is the major part of the body responsible for moving blood. Its primary function is to transport oxygen, nutrients, hormones, and other vital substances to cells throughout the body while also facilitating the removal of waste products like carbon dioxide and metabolic waste. The heart acts as the central pump of this system, pushing blood through a network of arteries, veins, and capillaries.

The respiratory system, while critical for the exchange of gases (oxygen and carbon dioxide), does not directly move blood; its function is more about facilitating respiration rather than circulating blood. The muscular system supports movement and helps in various bodily functions, but it is not primarily responsible for the movement of blood itself. The digestive system focuses on breaking down food and absorbing nutrients rather than circulating blood. Therefore, the circulatory system stands out as the key system designated for the movement of blood throughout the body.