The true statement is B. Teens are more vulnerable to contracting an STI because their bodies are less developed than adults. Also, from statistics, it has been reported that there are approximately 20 million new cases of STI in the US each year. Most of these cases are from the age group 15 - 24. The bodies of these teens are more biologically susceptible to STIs.
The answer is A, intrinsic motivation comes from within and doesn't depend on an outside source.
A nerve impulse is a way nerve cells (neurons) communicate with one another. Nerve impulses are mostly electrical signals along the dendrites to produce a nerve impulse or action potential. The action potential is the result of ions moving in and out of the cell.
A nerve impulse travels from the dendritic end towards the axonal end. The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
