$5,500 unfavorable variable overhead spending variance = $100,000 â $94,500. Variance is unfavorable because the actual variable overhead costs are higher than the expected costs given actual hours of 18,900.
exists and is an alternate of . Histamine is a chemical mediator. These are released by mammalian cells and effect their cells in their immediate vicinity. Histamines are released from white blood cells in the airways, they are released in response to injury or an allergen. They cause small arteries and arterioles to dilate and the permeability of capillaries to increase.
When the histamine arrives at the site of irritation, it causes several important effects. One is the dilating, or widening, of small blood vessels in that area. This is known as an inflammatory response, or swelling. Swelling increases the flow of blood to the area.