How Many Valves Does a Heart Have?
Ⓐ   One Ⓑ   Two
Ⓒ   Four Ⓓ   Six
 1 of 24  
How Many Valves Does a Heart Have?
Ⓐ   One
Ⓑ   Two
Ⓒ   Four
Ⓓ   Six
1 of 24