. Kirkes' handbook of physiology . es begin a littlefurther back toward the fundus each time and follow over the pyloricantrum with clocklike regularity, in the cat one wave in ten seconds, whichrequires in each case about twenty seconds for its completion. In man theyare doubtless slower. These peristalses continue during the whole period ofdigestion, for as much as seven or even more hours. These peristaltic contractions aid the gastric juice in carrying away the MOVEMENTS OF THE STOMACH 329 softened layers of food by propelling it into the pylorus. There it is thoroughlymixed with the gastr
. Kirkes' handbook of physiology . es begin a littlefurther back toward the fundus each time and follow over the pyloricantrum with clocklike regularity, in the cat one wave in ten seconds, whichrequires in each case about twenty seconds for its completion. In man theyare doubtless slower. These peristalses continue during the whole period ofdigestion, for as much as seven or even more hours. These peristaltic contractions aid the gastric juice in carrying away the MOVEMENTS OF THE STOMACH 329 softened layers of food by propelling it into the pylorus. There it is thoroughlymixed with the gastric juice, forming the chyme. Figure 261 gives an idea ofthe movement of the food in the antrum. The peristaltic contractions carryit forward, but if the valve does not open to permit passage to the duodenum,then the pressure will force the chyme back through the center toward thefundus. After several minutes the pyloric sphincter will occasionallv relaxto allow fluid food to pass to the duodenum, but when more solid particles come. 12M. 2RM.
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