Test 3 Review: Blood Vessels, Lymphatics, and Nervous Systems 23, Be able to exp

Question

Test 3 Review: Blood Vessels, Lymphatics, and Nervous Systems

23, Be able to explain the role of blood pressure for the moving of blood in the body

24, Be able to state the location for the three different tonsils in the body

25, Be able to explain the role of the reticular formation

26, Be able to state and describe the anatomy for a cross section of spinal cord

27, Be able to explain the difference between divergent and convergent circuits within the nervous system

28, Be able to explain the role for the nodes of Ranvier in salutatory conduction

29, Be able to state the embryonic formations of the nervous system and what each structure will become in the future as the nervous system matures

30, Be able to explain the anatomy and function for lacteals

Explanation / Answer

28.Nodes of Ranvier are approximately 1 m wide and expose the neuron membrane to the external environment. These gaps are rich in ion channels, which mediate the exchange of certain ions, including sodium and chloride, that are required to form an action potential—the reversal of electrical polarization of the neuron membrane that initiates or is part of a wave of excitation that travels along the axon. The action potential propagated by one node of Ranvier jumps to and is regenerated at the next node along the axon, thereby enabling the action potential to travel rapidly along the fibre.Hence nodes of Ranvier perform Saltatoty conduction.Saltatory is a Latin word which literally meas ‘jump/hop’.

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