“lub” sound is produced after _________ ?
(A) The ventricles are fully contracted
(B) The ventricles start to relax
(C) The bicuspid and tricuspid valves suddenly close
(D) The semilunar valves are closed
Share this... |
Facebook
|
Twitter
|
Linkedin
|
Whatsapp
|
Your email address will not be published. Required fields are marked *