Blood vessels. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body: The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium.The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.The pulmonary veins bring oxygen-rich blood to the left atrium. The aorta channels oxygen-rich blood to the body.hese bring blood to the lungs, where oxygen enters the bloodstream, and then to the body: The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.
Empiricism is a philosophical belief that states your knowledge of the world is based on your experiences, particularly your sensory experiences. According to empiricists, our learning is based on our observations and perception; knowledge is not possible without experience.
Gradualism, from Latin gradus (âstepâ), is a hypothesis, a theory or a tenet assuming that change comes about gradually or that variation is gradual in nature.Similar concepts are: uniformitarianism, incrementalism and reformism.n the natural sciences, gradualism is the theory which holds that profound change is the cumulative product of slow but continuous processes, often contrasted with catastrophism.