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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 ...
Testosterone is the primary male sex hormone and androgen in males. [4] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
In fact, a study in The Journal of Sexual Medicine found that nipple stimulation is arousing for 52% of men—yet only 17% of men have had their nipples played with during sex. Clearly, there’s ...
Over two-thirds of the research was done regarding four sports: rowing, cycling, athletics, and swimming. [14] In America, sports play a big part of the American identity, however, sports science has slowly been replaced with exercise science. [18] Sports science can allow athletes to train and compete more effectively at home and abroad. [18]
A new study found that omega-3 slowed biological aging by up to four months, with vitamin D and strength training boosting the effects: A neurologist explains.
The best approach to specifically achieve muscle growth remains controversial (as opposed to focusing on gaining strength, power, or endurance); it was generally considered that consistent anaerobic strength training will produce hypertrophy over the long term, in addition to its effects on muscular strength and endurance.
3. Folic Acid. Folic acid is a synthetic form of folate, a B vitamin found naturally in many foods. If you eat lots of dark leafy greens (like broccoli, spinach and asparagus), beans, nuts, seeds ...