Blood
What is blood? Blood is a constantly circulating fluid providing the body with nutrition, oxygen, and waste removal. blood is mostly liquid, with numerous cells and proteins suspended in it, making blood "thicker" than pure water. How is blood carried to and from the heart? Blood moves through many tubes called arteries and veins, which together are called blood vessels. these blood vessels are attached to the heart. blood going towards the heart is carried through veins. blood going away from the heart is carried through arteries. How does blood travel through the heart? The pathway of blood through the human heart consists of a pulmonary circuit and a systemic circuit. deoxygenated blood is oxygenated in the pulmonary circuit. deoxygenated blood flows through the heart in one direction, entering through the superior vena cava(heart's veins) into the right atrium. from here, it is pumped through the tricuspid valve into the right ventricle before being pumped out throug...