Even methane (natural gas) is lighter than air, but not by much. Carbon dioxide, which is contained in the air we breathe out and is also easily and safely manufactured by mixing bicarbonate of soda and vinegar, is heavier than air. It tends to sink to the floor and accumulate. So it's a good job that houses aren't air tight.
Cuddling, holding, and sexual play releases chemicals, like oxytocin, in the brain that create a sense of well-being and happiness, says Dr. Renee Horowitz, an ob-gyn who recently opened the Center for Sexual Wellness in Farmington Hills, Michigan.
View Full Document. 1  Corticosteroids - Steroid hormones released by the adrenal cortex. adrenal medulla - inner like a knot of nervous tissue Mineralocorticoid - Steroid hormone of the adrenal cortex that regulates Na+ and K+ metabolism and fluid balance. Glucocorticoids - Adrenal cortex hormones that increase blood glucose levels and aid the body in resisting long-term stressors.