THE HEART - CHAPTER 19

________ blood through pulmonary trunk into pulmonary valve to exchange CO2 for O2.

________ has its own supply of blood vessels to deliver blood to every muscle cell.

________- alternative route for arterial anastomoses that can supply heart tissue with blood if primary route becomes obstructed.

________- blood vessels of the heart.

________ forced to open when ventricles contract, blocking blood from flowing into them.

________- thick partition between the lungs.

________- relatively short, thick, branched cells.

________ has 2 branches.

________- route by which blood leaves an organ.

________- supplies blood to every organ of the body, including other parts of the lungs and the wall of the heart itself.

________ (chordae tendineae) connect valve cusps to conical papillary muscles on floor of ventricle.

________ gives pathways to upper limbs and head.

________- right atrium and both auricles exhibit internal ridges of myocardium.

________- consists of heart and blood vessels.

________ has 2 branches.

________- distribute electrical excitation to cardiocytes of ventricles.

2 major divisions: ________- carries blood to lungs for gas exchange and returns it to heart.

________ arise in cervical ganglia through cardiac plexus and continue by way of cardiac nerves to the heart.

________- contraction.

________- relaxation.