1.What is the secondary structure of a protein? 2.What causes proteins to become denatured?
3.How does the tertiary structure of a protein form?

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.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: