Inductive definition of CW complexes. If the largest dimension of any of the cells is n, then the CW complex is said to have dimension n. If there is no bound to the cell dimensions then it is said to be infinite-dimensional. The n-skeleton of a CW complex is the union of the cells whose dimension is at most n.
Deoxygenated blood enters the right atrium through three major veins: the superior and inferior vena cava and the coronary sinus. The superior vena cava returns all of the blood to the heart from tissues superior to the heart in the head, neck, arms and upper thorax.
Specifically, the superior and inferior vena cava carry deoxygenated blood back to the heart. The superior vena cava is bringing deoxygenated blood from the head and upper torso back to the heart's right atrium. The pulmonary vein brings in oxygenated blood from the lungs through the left atrium and ventricle up into the aorta which then carries the oxygenated blood through the â¦ body.