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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 ...
The returning soldier effect is a phenomenon which suggests that more boys are born immediately after wars. [1] [2] This effect is one of the many factors influencing human sex ratio. It was especially noticeable worldwide during and right after both of the World Wars. [3]
Here's what doctors and public health experts recommend as kids return to school across the United States.
Back-to-school season evokes thoughts of new pencils, autumn leaves and the return of sweater weather. It’s also marks a new school year as kids return to classes after the long summer break.
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.
After-school activities, also known as after-school programs or after-school care, started in the early 1900s mainly just as supervision of students after the final school bell. [1] Today, after-school programs do much more. There is a focus on helping students with school work but can be beneficial to students in other ways.
research should command as high a priority as increasing our already generous purchasing practices for childhood vaccines. The questions raised by an increasing number of families, those affected by autism,