The circulatory and respiratory systems interact to maintain homeostasis by
a. blood cells picking up and carrying oxygen from the lungs to the body's cells.
b. the collection and return of fluid from the lymphatic system that leaked from the blood vessels.
c. blood plasma transporting salts, sugars, fats and dissolved proteins through the body.
d. the coordination of the diaphragm and rib cage moving air into and out of the lungs.

Blood cells picking up and carrying oxygen from the lungs to the body's cells (Ans. A)

Explanation:

Red blood cells (RBC) have the main function of carrying oxygen. These cells are present in our blood & their journey begins in the lungs where they picking up & carrying oxygen from the air we breathe. Then the blood cells travel to the heart through the veins, which pump out the blood & delivering oxygen to all parts of our body.  

So, the correct option is A.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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