Cardiovascular Part 2

____forms a tough protective sac (pericardial sac), which heart sits in Thoracic cavity

The wall of the heart is composed of what 3 distinct layers?

_____holds everything together outside of heart, visceral layer infects->percarditis

___ is the thickest layer, muscle layer doing contraction of 2 seperate groups of tissues in the heart muscle

In cardiac cycle____is interconnected lattice of cardiac muscle fibers which essentially function and contract as asingle unit

What are 2 active syncytia in heart?

____ is composed of both atria that contract as a unit to form a network of cardiac muscle fibers and pumping what remains in blood

___is what each syncytium are called

___are highly specialized pieces of cardio muscle tissue, myogenetic and found in upper atria and btwn atria and ventricle in heart

___ are self-excitatory,has a pacemaker and non-contractile fibers

____myocardium creates it's own signal

____goes at a rate of it's own and creates signal that causes the rest of heart muscle to contract

____Primary pacemaker of heart, artifically stimulate heart, pacemaker sends signal to start whole contraction and iswhere superiorvenacava

____S-A NODE fires->impulse reaches and leaves A-V NODE->impulse around Purkinjie fibers & ventricular contraction

____muscle tissue

___nerves from tip of heart