lymph and conduction systems of the heart Flashcards
what is the lymphatic drainage of the heart?
subepicardial lymphatic plexus to tracheobronchial node
why does the heart not require a nerve supply to beat rhythmically?
it has its own conduction system
when is a nerve supply necessary?
to alter the rate of beating
what increases heart rate and strength of contraction and dilates coronary arteries?
sympathetic activation
what decreases heart rate and strength of contractions and constricts arteries?
parasympathetic activation
what is the cardiac plexus divided into?
superficial and deep cardiac plexus
what is sympathetic innervation of the heart?
from cervical and thoracic cardiac nerves from sympathetic trunk T1-T4
parasympathetic innervation of the heart is from?
vagus nerve
rhythmic beating of the heart is controlled by?
specialized cardiac muscle fibers which are collectively known as the conduction system
what are the parts of the conduction system?
sinuatrial node- natural pacemaker atrioventricular node- septal wall atrioventricular bundle -right and left bundle branches subendocardial plexus of conduction cells
describe the conduction impulse
1 begins in sinuatrial node
2 spreads through atrial wall to reach atrioventricular node
3 impulse travels through atrioventricular bundle and its 2 bundle branches to subendocardial plexus and conduction cells
4 travels to myocardium of ventricles
aorta exits from?
left ventricle
pulmonary trunk exits from?
right ventricle
what are the branches of the pulmonary trunk?
left and right pulmonary arteries
*deoxygenated
what vessels enter the heart?
Pulmonary veins- to left atrium *oxygenated
Superior and Inferior vena cava- to right atrium *deoxygenated
