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Vagusstoff (literally translated from German as "Vagus Substance") refers to the substance released by stimulation of the vagus nerve which causes a reduction in the heart rate. Discovered in 1921 by physiologist Otto Loewi , vagusstoff was the first confirmation of chemical synaptic transmission and the first neurotransmitter ever discovered.
He called the unknown chemical Vagusstoff, naming it after the nerve and the German word for substance. It was later found that this chemical corresponded to acetylcholine . His experiment was iconic because it was the first to demonstrate the endogenous release of a chemical substance that could cause a response in the absence of electrical ...
There is a hint in the terminology as to why the practice was considered indecent. The most commonly used verb for masturbation is "to soften" (dephesthai), while for most Greeks, male sexuality was essentially about power dynamics. In bed, it all came down to active versus passive.
In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth —height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed.
1) Touch your taint. If you haven’t already been introduced, meet your taint—or your perineum, if we’re getting technical.It’s the strip of skin between your balls and your butt, and it ...
In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth —height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed.
The human sexual response cycle is a four-stage model of physiological responses to sexual stimulation, [1] which, in order of their occurrence, are the excitement, plateau, orgasmic, and resolution phases. [2] This physiological response model was first formulated by William H. Masters and Virginia E. Johnson, in their 1966 book Human Sexual ...
[1] [2] Estrogen also induces growth of the uterus, proliferation of the endometrium, and menstruation. [1] Female secondary sex characteristics include: Enlargement of breasts and erection of nipples. [1] [2] Growth of body hair, most prominently underarm and pubic hair. [4] [1] [2] Widening of hips; [1] [2] lower waist to hip ratio than adult ...