The Communication between the Cells - Essay Example

Because it does not have an interneuron. This is because stretch reflex takes place without thinking like coughing to clean the windpipe and the process does not occur through the spinal cord. C (because it has two interneurons) is a wrong answer because all processes that take place through the spinal cord are the ones that have two interneurons. C is the correct answer because sodium ions are the most abundant in the extracellular fluids. D is the correct answer because acetylcholine is just involved in minor signal transmission, in the nervous system. B is not the correct answer because Serotonin is well known, and it is involved in the regulation of anxiety and feelings of depression. A is the correct answer because sciatic nerves are primarily involved in transmitting signals from the legs to the brain. C is wrong because pudendal nerves are found in the pelvis, but not the leg. B is the correct answer because the primary motor area of the brain is the one responsible for voluntary, fine motor movements. C is wrong because the primary sensory area is responsible for detecting signals that are sent to the brain.

D is the correct answer (he was frustrated). This is because alpha waves are detected when the brain is experiencing quietly flowing thought. C is wrong because when someone when the brain is asleep, it does not experience quietly flowing thoughts. C is the correct answer because delta waves suspend all external awareness and are only detected when the brain is dead asleep. B is not the correct answer because when someone is awake or resting with their eyes wide open, then their brains are subjected to external feelings.

Action potential refers to the short-lasting event or an impulse that occurs in the neurons when the electrical membrane potential (charge) of the cell rapidly rises then falls. It takes place in the excitable cell-like neurons and muscle cells. This is because T tubules do not have the voltage-gated Na+ and K+ channels, which are found on the plasma membrane. Therefore they carry action potential through their interior muscles cells through voltage-gated Na+ and K+ channels. Voltage-gated ion channels, on the cell’s plasma membrane, generate action potentials. The channels become shut at the point when the membrane potential is near the resting membrane potential of the cell. There is a change across the cell membrane in polarity as the action potential travels through the axon. The K+ and Na+ gated ions channels open and then close as the membrane reaches the threshold potential as it responds to signal from another neuron. The Na+ channel opens allowing the sodium ions to move to the axon, which causes depolarization. This is reversed at the cause of depolarization when the K+ channel opens and the K+ ions move into the axon.