Select the correct partial path below. this path is part of the complete blood flow pathway. you should be able to trace flow starting in any location. select the correct partial path below. this path is part of the complete blood flow pathway. you should be able to trace flow starting in any location. pulmonary trunk to pulmonary arteries to pulmonary capillaries to pulmonary veins returning to the right atrium. systemic veins returning to the left atrium and forward through the mitral valve. aorta to smaller systemic arteries to systemic capillaries to systemic veins to right atrium through the tricuspid valve pulmonary artery into left atrium through mitral valve to left ventricle

The right answer is: aorta to smaller systemic arteries to systemic capillaries to systemic veins to right atrium through the tricuspid valve.

The blood pathway is divided into two circuits, both beginning and ending in the heart.

- Systemic circulation (or general circulation, or "circulation")

It begins in the left ventricle, which through an artery distributes oxygenated blood to organs. Then the blood returns to the right heart (right atrium) through the cellar veins.

Each organ has an afferent vessel, supplying blood, and an efferent vessel carrying non-oxygenated blood.

- The pulmonary circulation (or "small circulation")

It begins in the right ventricle, from where the pulmonary artery sends blood without hematosis to a single organ, the lung. The blood is then oxygenated and returns to the left heart (left atrium) by the pulmonary veins.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.