Simultaneous Contraction Case Study
The heart performed the pump action by a sequence of alternating contraction and relaxation of the heart muscle, and the term used for contraction is systole, and the term used for relaxation is diastole. I am explaining this because it is very important terms, and involve five stages:
1. The vagus nerve stimulate the sinoatrial node or SAN, which is the pacemaker of the heart. Is a small area in the upper wall of the Right atrium, close to the vena cava; the fibers of the of the SAN contract 70 times each minutes, and after that the impulse is disperse across the atrial cardiac muscle.
2. Simultaneous contraction occurs in both, the right and the left; that is mean between tricuspid and bicuspid valves.
3. The atria contraction sends impulses
1. The vagus nerve stimulate the sinoatrial node or SAN, which is the pacemaker of the heart. Is a small area in the upper wall of the Right atrium, close to the vena cava; the fibers of the of the SAN contract 70 times each minutes, and after that the impulse is disperse across the atrial cardiac muscle.
2. Simultaneous contraction occurs in both, the right and the left; that is mean between tricuspid and bicuspid valves.
3. The atria contraction sends impulses