The Water Cycle: The U.S. Geological Survey explains what the water cycle is and where water comes from. Animated Water Cycle: This animated water cycle diagram allows kids to click on different parts of the cycle to see how water changes form and moves.
The neuromuscular junction (NMJ) is the site of communication between motor nerve axons and muscle fibres. It is composed of four specialised cell types: motor neurons, Schwann cells, muscle fibres and the recently discovered kranocytes.
An alpha-motoneuron innervates the muscle cell, forming a neuromuscular junction. The presynaptic (neuron) side of the NMJ is specialized to allow the release of acetylcholine from the terminal in response to an action potential.O is the major inhibitory neurotransmitter causing relaxation of smooth muscle in the GI tract, and it is a significant contributor to the relaxation of vascular smooth muscle (Ach causes release of NO in the vasculature).