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As light enters the eye, it passes through the cornea and the lens and is eventually focused onto the retina.
Cornea, aqueous humor, lens, vitreous humor
trachea
lung
Blood passes through the bicuspid valve and enters the left ventricle.
throat, bronchies, lungs
the carotid artery passes through the carotid canal to the brain
it first passes through the duodenum
objective lens system
When a meteoroid enters the Earth's atmosphere, it is called a meteor. A meteor that passes through the atmosphere and strikes the ground is called a meteorite.
The following is the pathway of blood through the body: 1. blood enters the heart from the body through the superior & inferior vena cava 2. it enters the right atrium and passes through the tricuspid valve into the right ventricle 3. it passes from the right ventricle through the pulmonary valve, pulmonary artery and to the lungs to be oxygenated 4. oxygenated blood returns from the lungs and into the left atrium 5. it passes through the bicuspid valve into the left ventricle 6. it leaves the left ventricle through the aortic valve, into the aorta and out to the rest of the body
Oxygen in the lungs and passes through the alveoli, small sacs which allow gas exchange, and enters the blood to be pumped throughout the body.