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# Question 17 **Matching terms to their descriptions for nerve impulse transmission:** | Term | Description (A-F) | |---|---| | Axon | Part of a neuron that conducts impulses away from the cell body. | | Dendrite | Part of a neuron which receives incoming stimuli. | | Afferent | Nerve that transmi...

# Question 17 **Matching terms to their descriptions for nerve impulse transmission:** | Term | Description (A-F) | |---|---| | Axon | Part of a neuron that conducts impulses away from the cell body. | | Dendrite | Part of a neuron which receives incoming stimuli. | | Afferent | Nerve that transmits impulses from sense organs towards the central nervous system (CNS). | | Efferent | Part of a neuron that directs impulses away from the CNS towards a muscle or gland. | | Grey matter | Consists mainly of neuron cell bodies. | | White matter | Consits mainly of neuron cell fibers. | # Question 18 **Matching events to their descriptions:** | Event | Description | |---|---| | A. Resting potential | The cell is expending energy to maintain a membrane potential of -70mV.| | B. Depolarisation| There is a sudden surge of entry of sodium ions (Na+) because Na+ channels have opened. | | C. Repolarisation | Na+ channels closed and K+ channels opened so that K+ ions can exit the cell. | | D. Hyperpolarisation | There is a certain amount of overshoot so that the neuron membrane is more negative than at rest. | | E. Refractory | The plasma membrane is not responsive to stimuli until after the resting potential has been restored. |