Re: How long should I spend in Buenos Aires and Santiago. I have to agree, BA is amazing, especially if you are hanging with one of the locals! It is a great city with plenty to do in the day time and even more at night. Be prepared to stay out late... I was there for 6 days and loved it.e: How long should I spend in Buenos Aires and Santiago. If I only had one month in South America, I wouldn't spend much time at all in Santiago de Chile. It can be pleasant but I didn't think it was anything special at all. Most people are very enthusiastic about BA.
Ch.5: Synaptic Activity. Introduction. 1  Otto Loewi studied the heart of the frog, which-like our own hearts-is supplied by two different peripheral nerves. 2  One, the sympathetic nerve, excites the heart and makes it beat more rapidly; the other, the vagus, shows the heart. The influx of calcium during depolarization of the endfoot appears to activate a system of microtubules within the endfoot. 2  The microtubules exert mechanical force and induce the movement of vesicles toward the presynaptic membrane. 3  The vesicles then eject neurotransmitter into the synaptic cleft.
The transmission of information is accomplished in two ways: 1  Electrically: the neuron is directly adjacent to other neurons. 2  Chemically: there is a space (the synaptic cleft) between the axon terminus and the adjacent neuron.As the action potential reaches the end of the axon, a chemical is released that travels across the synaptic cleft to the next neuron to alter its electric potential.With very few exceptions, mammalian organisms use chemical means to transmit information. The vesicle merges with the presynaptic membrane. 2  The presynaptic membrane and vesicle now forms a continuous membrane, so that the neurotransmitter is released into the synaptic cleft. 3  This process is called exocytosis.