By contrast, postganglionic fibers in the parasympathetic division are cholinergic and use acetylcholine as a neurotransmitter. In the sympathetic nervous system, the postganglionic neurons of sweat glands release acetylcholine for the activation of muscarinic receptors.
The International Space Station (ISS) is made up of multiple materials. Lightweight metals, plastics, and carbon fibers make up the majority of the state. The International Space Station (ISS) is made up of multiple materials. Lightweight metals, plastics, and carbon fibers make up the majority of the state.
The ISS is perhaps the greatest example of what can be achieved through international cooperation. With a cost estimated at around $100 billion (Â£63 billion), the most expensive manmade structure ever assembled, the logistics and planning of building and operating a space station of this size have been stupendous. Today, many members of the public take the ISS for granted, with astronauts and cargo regularly making their way to and from the station 420 kilometres (260 miles) up seemingly with ease, but the construction and operation of this technological marvel have been anything but easy.