39. b)it operates on an all-or-none principle c)it is a depolarization d)it is o

Question

39. b)it operates on an all-or-none principle c)it is a depolarization d)it is on the postaynapt Which if the following is NOT true about an EPSP? A) its strength decreases with distance membrane 40 A neuron is more likely to reach the threshold of excitation with summation c)inhibitory summation d)an IPSP . A)GABA bytempora 41.A hyperpolarization is a)e xcitatory signal b)an IPSP c)triggers the threshold d)increases the likelihood of an action potential e)both a and d c)the voltage gets closer to the threshold d)both a and c membrane potential would be a) -70mV b) -10mV c) OmV d)10mV e)70mV A)positive ions enter the neuron b)positive ions leave the neuron 42. During an IPSP 43. If there was an equal number of positive and negative ions inside and out a neuron, the 44. The belief that behavior is a result of the physical body and the non-physical mind is called a)Darwinism b)dualism c)materialism d)psychic bodies 45 is defined as the ability of the nervous system to change in response to experience or the environment. A)epigenetics b)neuroplasticity c)dualism d)materialism e)variability 46. There are approximately 10 times more glia than neurons in the human brain. A)true b)false 47. The spinal cord is organized with sensory tracts being close to the neck while motor tracts are close to the waist. A)true b)false 48. Damage to the medulla is frequently fatal. A)true b)false 49. The somatic nervous system controls the heart, the stomach, and other organs. A)true b)false 50.A correlational study can prove eating breakfast causes grades to improve. A)true bfalse

Explanation / Answer

39.They operate on an all-or-none principle is not true about EPSP.In neuroscience, an postsynaptic potential (EPSP) is a postsynaptic potential that makes the postsynaptic neuron more likely to fire an action potential. 40.Temporal summation means that the effects of impulses received at the same place can add up if the impulses are received in close temporal succession. Thus, the neuron may fire when multiple impulses are received, even if each impulse on its own would not be sufficient to cause firing. 41.Hyperpolarization is IPSP.An inhibitory postsynaptic potentials (IPSP) is a temporary hyperpolarization of postsynaptic membrane caused by the flow of negatively charged ions into the postsynaptic cell.Hyperpolarization is a change in a cell's membrane potential that makes it more negative. It is the opposite of a depolarization. It inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold. 42.Positive ions leave the neuron;When an inhibitory neurotransmitter activates the receptor site, it causes additional potassium channels to open which may cause potassium ions to flow out of the cell and if additional positively charged potassium ions flow out of the cell, the inside of the cell will become more negative.In other words, inhibitory neurotransmitters cause an opening of ligand-gated potassium ion channels which leads to a local hyperpolarization (more negative than normal). This is known as a Inhibitory Postsynaptic Potential (IPSP). Due to time limit,only sone questions could be answered,the remaining can be asked as another qurstion,they will be answered,thankyou for your cooperation

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