1. effects on heart
... increased, which leads to both a shortened cardiac cycle and a greater time for ventricular filling. The vagus nerves (parasympathetic) decreases the ventricles capacity to contract, thereby limiting the maximum pressure. Acetylcholine (Ach) released by the terminals, increases the intracellular levels of cGMP, which decreases contractility, as well hydrolysing cAMP, which is needed for myocardial contraction. A third mechanism exists by which the vagus ... nerve releases ACh onto the cardiac sympathetic nerves, this prevents norepinepherine release and so inhibits sympathetic tone to t...
- Word Count: 1504
- Approx Pages: 6
- Grade Level: Undergraduate