THE CA1IU.AKY CIRCULATION 



223 



ciq 



coup 



FIG. 119A. SCHEMA OF KIDNEY. 



The renal capsule (c) encloses the whole, including arleries (a), capillaries (cap), 'and 

 veins (v), with surrounding lymph space (Is). The raembrana propria (mp), 

 confines the secreting cells (sc). The pelvis (p) and ureter, membrana propria 

 and capsule, are inextensile beyond a certain degree. 



FIG. 119s. SCHEMA OF EYEBALL. 



The rigid coat (c) confines the whole. The secreting cells (sc) are set on a membrana 

 propria (mp), and secrete the aqueous (aq). There is adjustment of capillarv- 

 venous to secreting pressure by latter acting on venous outlet (v). The flow of 

 blood through capillaries (cap) stops when aqueous pressure is raised just about 

 arterial pressure in (a). 



FIG. 119c. SCHEMA OF SALIVARY GLAXD. 



The alveolus, with secreting cells (sc) and duct, arc surrounded by a membrana propria 

 (mp), inextensilo beyond a certain degree. The capsule of the gland (c) is also 

 inextensile beyond a certain degree. The secretory cells (sc) raise the pressure 

 of saliva, and the membrana propria (mp) prevent strangulation of the circula- 

 tion through capillaries (cap) by limiting the expansion of the alveolus. A 

 certain amount of expansion is permitted, which, acting on the vein (v) just 

 before its exit through capsule, raises the capillary- venous pressure. The 

 capillaries and vein ; then become a more rigid system of tubes, and the flow of 

 blood from a to v is accelerated. 



