For submaximal testing, what percentage of the target heart rate must be attained?

Which of the following terms refers to the junctional epithelium that adheres to implant surfaces?

A) Perimucosal seal B) Gingival cuff C) Epithelial attachment D) Gingival connective tissue attachment

White blood cells (WBCs) are also called _______________. 

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