Homework # Psychology Essay

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14 September 2012 Homework #2 1) A) The parts to a neuron are the cell body, bushy dendrite fibers, the axons, and the myelin sheath. B) Neural impulses are generated when a neuron fires an impulse called the action potential, which is a brief electrical charge that travels down the axon. The first part of the axon begins the process by opening up its gate, so that positively charged ions can flood through the cell membrane. As a result, this process depolarizes that axon section, causing another axon channel to open and then the process repeats continuously after the other. C) In terms of communication, nerve cells communicate with one another by having the dendrites receive the messages from other cells. The dendrites job is to receive information and conduct it toward the cell body. Next, they send a neural impulse down the axon to the terminal branches of the axon, which then causes neurotransmitters to release in the synapse. These neurotransmitters attach themselves to the receptor sites of receiving neurons. 2) A) Neurotransmitters are chemical messages that cross the synaptic gap between neurons. In other words, neurotransmitters are the messages that nerve cells send out, and they cross the gaps between each of the cells. When released by the sending neuron, neurotransmitters travel across the synapse and neuron. Therefore, they influence whether that neuron will generate a neural impulse or not. B) An agonist mimics neurotransmitters functions by binding to receptor sites and stimulating the sending neuron. C) An antagonist does the opposite of agonist. They bind to receptors and block neurotransmitter functioning. 3) A) the four lobes of the brain are the frontal lobe, the parietal lobe, the occipital lobe, and the temporal lobe. B) One function of each would be: The frontal lobe is involved in speaking and
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