The SA node also responds to the need for a faster heart rate. If a person is exercising or excited, the body will require greater blood circulation. A healthy SA node responds to these changes in the body and increases the heart rate accordingly. More about The healthy heart's electrical system , The heart pumping . More about InterStim Therapy for Urinary Control. .
Sacral nerves control the bladder, bowel and pelvic organs.
More about InterStim Therapy for Urinary Control. . If a good to level of pain relief is achieved during the screening test, long-term implantation is performed. The aortic and pulmonary valves within the human heart are called semilunar valves because their leaflets have a half-moon configuration. See also aortic valve , pulmonary valve . If a pacemaker senses a natural heartbeat, it will not send a pacing pulse to the heart.