What is a difference between systemic and pulmonary circulation?

a.
systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs.
b.
systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.
c.
systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body.
d.
systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body

B. Systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.  

Explanation:

Systemic circulation carries oxygenated blood to the body.

Pulmonary circulation carries deoxygenated blood to the lungs.

The other options are wrong. Systemic circulation carries oxygenated blood to the body.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

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