Convection currents can happen in liquids and gases. For example when air is heated it becomes less dense and rises. This means that cooler more dense air comes down and is also heated rising up above more cooler air etc. This creates a convection current.
Here is a diagram of a hot water tank heater:
(sorry it isn't that great I did it myself just now)
3 C6H12O6,
C=3*6=18 Carbon atoms
H=3*12=36 Hydrogen atoms
O=6*3=18 Oxygen atoms
Cocaine selectively blocks sodium channels which is the mechanism that leads to local anesthetic effects.
Voltage gated sodium channels play very important roles in the body as they are responsible for action initiation and propagation in excitable cells, such as nerves, muscles and neuroendocrine cells. Like other sodium ion channels blockers such as lidocaine, Cocaine selectively blocks sodium ion channels which denies entry of sodium ions in the cell, thus leading to local anesthetic effects.
The statement that describes a chemical reaction at equilibrium is 4)<span> </span><span>The concentrations of the products and reactants are constant.</span><span>
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B upper boundary of the zone of saturation, land beneath this line is saturated with water.