On the figure of the male reproductive system, identify number 12: _______________ _______________. 

An account that is open to charges made occasionally as needed is called a(n) ____. 

A. single-entry account B. open-book account C. account payable D. written-contract account E. collection account

An autoimmune disease characterized by pain, inflammation, and deformity of the joints is ____________________.

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