Which of the following shows the correct order of structures?
a.
cells tissues organ systems organs
b.
cells organ systems tissues organs
c.
cells tissues organs organ systems
d.
cells organs tissues organ systems

The answer is C cause organ system is like respiratory system consist of many organs including nose, trachea, and lungs

im back lol i heard you where asking for me

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.