The four statements below describe some of the events that occur during the flow of blood through the heart. By placing the numbers 1 to 4 in the boxes, indicate the correct sequence of these events, starting immediately after deoxygenated blood has entered the heart and ending as the blood is sent to the lungs. The right atrium contracts.

The semilunar valves open.

The right ventricle contracts.

The tricuspid valve closes.

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micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying