________ There are two types of polio vaccines: inactivated polio vaccine (IPV) and live oral polio vaccine (OPV)

The structure of the contractile subunit of the myofibril is called the:

a. sarcoplasmic reticulum. b. actin. c. motor end plate. d. sarcomere.

B-lymphocytes predominate in the body's response to ________

Fill in the blank(s) with correct word