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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 ...
This is an illustration demonstrating the Wolfsdorf Staging for axillary hair development in children. [1] [2]Underarm or axillary hair goes through four stages of development, as staged by the Wolfsdorf Axillary Hair Scale, [2] driven by weak androgens produced by the adrenal in males and females during adrenarche, and testosterone from the testicle in males during puberty.
Keep in mind, though, that waiting too long can decrease sexual desire, increase the chances of premature ejaculation, and reduce the intensity of erections, according to Elist.
Terminal hair growth on arms is a secondary sexual characteristic in boys and appears in the last stages of puberty. Vellus arm hair is usually concentrated on the elbow end of the forearm and often ends on the lower part of the upper arm. This type of intense arm vellus hair growth sometimes occurs in girls and children of both sexes until ...
The prostate, a.k.a. the "male G-spot," can produce mind-blowing orgasms. Sex experts explain where it is, how to stimulate it, and more.
Vagusstoff transmitted inhibition from the vagus nerves, and Acceleransstoff transmitted stimulation from the sympathetic nerves to the heart. [31] Loewi took some years to commit himself with respect to the nature of the Stoffe , but in 1926 he was sure that Vagusstoff was acetylcholine, writing in 1936 [ 32 ] "I no longer hesitate to identify ...
[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 ...