Please capitalize where necessary: hyperkalemia is expressed by markedly higher than normal concentrations of potassium in the blood.
A: Hyperkalemia is expressed by markedly higher than normal concentrations of potassium in the blood.

Please capitalize where necessary: after we calmed down a little, here came the cops down the street.
A: After we calmed down a little, here came the cops down the street.

Please capitalize where necessary: this means that you can quickly find related information.
A: This means that you can quickly find related information.

Please capitalize where necessary: 9 and they sung a new song, saying, thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to god by thy blood out of every kindred, and tongue, and people, and nation;
A:
9 And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;