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.
The N-methyl-D-aspartate receptor (also known as the NMDA receptor or NMDAR), is a glutamate receptor and ion channel protein found in nerve cells. property of the NMDA receptor is its voltage-dependent activation, a result of ion channel block by extracellular Mg 2+ & Zn 2+ ions. This allows the flow of Na + and small amounts of Ca 2+ ions into the cell and K + out of the cell to be voltage-dependent.