1. once the action potential reaches the axon terminus, the information needed to be sent through the synapse to the muscle fiber. how is this signal sent.

2. explain the process of contraction of the sarcomere addressing what signals the muscle to contract, how the signal is transmitted into the fiber, and the role of calcium, and ultimately how the contraction occurs

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sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.