What is the function of kinetochore microtubules in the mitotic spindle? O A. They keep sister chromatids in pairs
B. They define the furrow during cytokinesis
C. They break down the nuclear envelope
D. They attach to chromatids and pull them towards the poles of the cell

one would be wind another would be water density

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.