________ is unwanted jitter or interference on the EKG tracing

A pressure-regulating device on a standpipe and hose system limits the pressure to ___ psi (kPa)

A. 50 B. 100 C. 150 (1 034) D. 200 (1 378)

The study of matter and chemical reactions in the body is ________. 

Fill in the blank(s) with the appropriate word(s).