Orthodontic costs vary greatly around the country. An average case fee is about $5000-$6000. Most offices will offer a variety of payment plans. An in house finance with no inâ¦terest typically will only finance the length of treatment with a 20-25% down payment. Average length of treatment is 18-24 months. Making your monthly payment $200-$300.
Under normal conditions, electrical activity is spontaneously generated by the SA node, the physiological pacemaker. This electrical impulse is propagated throughout the right atrium, and through Bachmann's bundle to the left atrium, stimulating the myocardium of the atria to contract. The conduction of the electrical impulse throughout the atria is seen on the ECG as the P wave. As the electrical activity is spreading throughout the atria, it travels via specialized pathways, known as internodal tracts, from the SA node to the AV node.
In a normal heart, the electrical impulse resulting in  depolarization and contraction of the cardiac muscle originates in  the sinoatrial (SA) node and propagates through t â¦ he atria to the  atrioventricular (AV) node before moving on to the ventricles.  When the electrical impulse for muscle contraction is generated, it  travels throughout the muscle of each atrium, causing atrial  contraction. the impulse then travels to the atrioventricular (AV)  node.   according to Medical Assisting-administrative and clinical  procedures with anatomy and physiology.