The heart is the pump that circulates blood throughout the body. The body itself does not actively push the blood along by any means, though there are one-way valves in the veins where the pressure is lower. Ultimately the deoxygenated blood reaches the heart due to the pressure of the blood behind it, constantly being pumped forward by the heart.
Veins... ateries move oxygenated blood.
Red blood cell
Erythrocytes also known as red blood cells contain haemoglobin that transports oxygen by combing with it to form oxyhaemoglbin.
oxygen transport to cell & carbondioxide away from cells.
The cardiovascular system, specifically the red blood cells, is what transports oxygen to the muscles.
Blood transports oxygen nutrients and wastes in mammals and fish .
The lungs take oxygen into the body and the blood transports oxygen throughout the body.
Hemoglobin transports gasses around the body. Hemoglobin contains iron and other minerals. It forms HbO8 and HbCO2 when bond with gasses.
Blood transports oxygen throughout the body. It transports through veins towards the lungs and then to the heart. The heart then pumps this oxygenated blood through the aorta and transports it throughout the body through arteries and capillaries.
By the currents themselves - water contains oxygen (hence H2O), and nutrients, thanks to decaying (biotic) matter which, yes, contains nutrients even when no longer living.
transports oxygen <3
hemoglobin
maybe oxygen or water