During the repolarization phase of the action potential of cardiac contractile cells ____exits the cells

Identify the organ labeled B

After blood flows through the pulmonary trunk it goes to the ________

After blood flows through the tricuspid valve it goes to the ________.

If the pulmonary semilunar valve did not close there would be a backflow of blood into

Name one hormone released from the gland labeled A

Blood within the superior/inferior vena cava returns to the ________.

Identify the structure labeled T  

  What layer of the uterus has smooth muscle and responsible for contracting during childbirth

  What is the function of the structure labeled U