T twin New member May 4, 2010 #1 When your heart beats Choose one answer. a. All chamber contract at the same time b. The right atrium contracts first c. The left and right artia contract first d. The left atrium contacts first
When your heart beats Choose one answer. a. All chamber contract at the same time b. The right atrium contracts first c. The left and right artia contract first d. The left atrium contacts first
