Capillary walls are only one cell thick, so oxygen can pass out of the blood, and waste material can pass into the blood.

Which of the following would be appropriate for soaking instruments covered with bioburden during a surgical procedure?

a. isopropyl alcohol b. peracetic acid c. sterile saline d. sterile water

Which of the following pairs are isomers?

A. , and  
B. CH₃CH₂OH and CH₃OH
C. CH₃CH₂CH₂CH₃ and CH₃CH(CH₃)CH₃
D. CH₃CH₂CH₃ and CH₃CH₃