4) The leters below stand for the following terms: A Axon D-Dendrite S- Synapse

Question

4) The leters below stand for the following terms: A Axon D-Dendrite S- Synapse CB-Cell Body Thus, a typical sequence of structures between a receptor and an effector is a. D-CB-A-S-D-CB-A b. A-D-CB-S-A-D-CB c. D-CB-A-S-A-CB-D d. D-A-S-CB-D-A-CEB 45) You have set up 2 electrical recording instruments that will record any electrical changes that occur. One is placed at each end of a single neuron 10 cm long. If at the first pair of electrodes, the magnitude of the action potential is recorded at 100 mV, what will be the end? magnitude of the action potential when it reaches the second pair of electrodes at the other a. 10 mV b. less than 100 mV but cannot be more exact c. 100 mV d. more than 100 mV but cannot be more exact e. 1000 mV 46-50 refers to the diagram below. +20 -25 -50 -70 Miliseconds 46) What is the resting potential? d. -70mV b. OmV C. -50mV a. +50m 47) What is the threshold potential? b. OmV C. -50mV d. -70mV a. +50mV 48) During which interval (a,b,c,d,e) would the transmitter substance be active? 49) During which interval would Na'ions be entering the neuron? 50) During which interval would k' ions be leaving the neuron?

Explanation / Answer

44. The structures present between the receptor and effector would be

Dendrite acts as receptor which receives the signals, which is passed on to the cell body and travels down to axon. At the axon with the help of synapse the information is transferred to the effector.

D-CB-A-S-D-CB-A

45. When an action potential is generated at one end of the neurons, by the time it reaches the other end, the action potential would have increased. As stimulus strength increase it recruit more fibres and therefore action potential adds up to produce more higher action potential.

46. The resting potential is when a neuron is at rest which is around -70mV

47. The action potential is an explosion of electrical activity which is created by depolarization of the neuron membrane. This happens by opening of voltage gated sodium channels. The threshold potential is around -50mV which causes the neuron to initiate the action potential.

48. When the action potential is generated, it is the point where the neurotransmitters are active. This would happen in the D phase of the curve.

49. During the C phase of the curve the voltage gated sodium channels open and the ions enter into the neurons.

50. During D phase of the curve, the voltage gated potassium channles open and ions leave the neuron.

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