Neurophysiology of Nerve Impulses

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EXERCISE 3: Neurophysiology of Nerve Impulses

|ACTIVITY 1: The Resting Membrane Potential |Answers | |The nervous system contains two general types of cells: neuroglia cells and |C- Neurons | |nerves. | | |cell bodies. | | |neurons. | | |nephrons. | | |The resting membrane potential of the neuron in this lab under the control conditions was _______ |0 | |mV. | | |True or False: For most neurons, the concentration of Na+ and K+ ions inside and outside the cell|True | |are the primary factors that determine the resting membrane potential. | | |Explain why increasing the extracellular K+ causes the membrane potential to change to a less |Increasing the extracellular K+ causes the membrane potential to| |negative value. |change to a less negative value because when K+ ions diffuse out| | |across the membrane they are leaving behind a net negative | | |charge. | |Discuss the relative permeability of the membrane to Na+ and to K+ in a resting neuron. |There are Na+/K+ pumps on the membrane that pump the Na+ back | | |outside and the K+ back inside. The charge of an ion inhibits | | |membrane permeability (that is, makes it difficult for other | | |things to cross the membrane). | |Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. |If there is an increase in Na+ extracellular the ions will flow | | |through an open channel from a region of higher concentration to| | |a region of lower concentration resulting in an increase in | | |intracellular Na+. | |ACTIVITY 2: Receptor Potential | |The “receiving end” of a sensory neuron is called the sensory receptor. It has proteins that can...
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