Most effector the organs receive dual innervation, but some (e.g., adrenal medulla, sweat glands, the pilomotor muscles, and many blood vessels) are innervated by only the sympathetic nervous system.this, the stimulation of either the sympathetic or the side parasympathetic innervation results in salivary secretion.
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answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.
stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.