Refractory period (sex) autonomic feedback mechanism, rather than through central chemicals like oxytocin, serotonin, and prolactin. Autonomic feedback is already known to regulate other physiologic systems, such as breathing, blood pressure, and gut motility. This theory suggests that after male ejaculation, decreased wall tension in structures such as the seminal vesicles leads to a change in the fine autonomic signals sent from these organs, effectively creating a negative feedback loop. Such a mechanism is similar to decreased gastric and bowel motility once gastric contents have passed through. Once the feedback loop has been created, the refractory period remains until the loop is broken
Refractory benefits of precast refractory shapes are related to simplified installation and repair logistics, which can reduce costs and down times. Using precast shapes eliminates forming labor, materials, equipment costs, actual placement time and expense, and associated costs during form removal, curing, and cleanup. It shifts these costs back to the manufacturer of the shape, who can absorb them much efficiently by spreading them over the overall production capacity. Refractory installation contractors have begun to consider precast refractory shapes much like they do any other pre-manufactured item such as block insulation, ceramic fiber blanket, anchors, etc. These items can be bought