Final answer:
The statement is false. Dilation of the precapillary sphincter increases blood into the capillaries, potentially raising the blood capillary pressure (BCP), contrary to the assertion that it leads to decreased BCP.
Step-by-step explanation:
The statement in question is false. If the precapillary sphincter dilates, this allows more blood into the capillaries, which would increase the volume of blood in that area and subsequently might increase the blood capillary pressure (BCP). The sphincters' role is to regulate the flow of blood into the capillary beds based on the body's needs, such as during physical activity or after eating. Sphincters respond to various chemical signals and can either constrict or dilate.
When they dilate, blood flows through the capillaries; when they constrict, blood flow to that region is halted, either being rerouted or stopped. Environmental conditions such as tissue oxygenation levels will influence the sphincters' opening or closing.
Understanding the dynamics of the precapillary sphincter is crucial for comprehending blood flow regulation. A dilated sphincter increases blood flow, contributing to higher blood capillary pressure, which is essential for efficient nutrient and oxygen exchange in tissues.