Show Telegraph Signals Controlling Blood I Flow low From Heart Described by Medic PHILADELPHIA April 19 JP- JP N Nerve signals which the arteries send to the heart to control its speed of beating bealing were described d today to the American Philosophical cal society Apparently these signals by their efficiency account for lor the longevity of the heart in enabling it to meet the qui quick k changes or long duration of stress and md emotion Dr Detler DeUer W W. Bronk Brank chairman of the Johnson foundation for medical medical medi medi- cal physics of the University of Pennsylvania told how he caused the signals to write their records records on on pl paper r by attaching electric wires at various points on the nerve transmission system They are simple dot signals like those of a telegraph wire They never vary in size or er Intensity but carry their messages me ages by changing chang ing frequency that frequency that is the number num ber of them sent every second Responding to pressure in certain cere tain sensitive places in blood ves ves- vessels ad sels s the dots Increase in rapidity as the pressure rises Normal pressure pres sure causes them to send about 15 dots a second Doubling that pres pres- pressure pressure sure would about double the number number number num num- ber of dots Sex artery signals are transferred in the brain to two nerves One of the nerves the slows down heart beats The other the sympathetic sympathetic speeds up the heart Thus high pressure in an artery 1 calling for lor more blood to be I pumped by the heart henrt rushes a faster fast fast- i ier er dot signal to the heart by both nerve systems One system speeds the heart pump faster and more while the theother theother other puts on the brakes to keep the life lite pump from overdoing If the signals drop meaning less rap rap- 1 Id heart beats needed the nerve slows down the heart while JhUe t the sympathetic holds it from slowIng slow slow- lag Ing down too much for safety The blood ves vessels els of f the abdomen abdomen abdomen abdo abdo- men have a somewhat similar set of signal nerves Changes In rate of breathing and other bodily variations variations vari van appear to use a similar code to get orders through to the heart |