Volume : 2, Issue : 3, MAR 2016

SALTATORY CONDUCTION: UNCOVERING THE MIND OF BIOLOGY STUDENTS

Píriz Giménez N., Tucci Añon J, Lezama JA, Terevinto E.

Abstract

Saltatory conduction of action potentials is part of the Biology curriculum which is taught since Secondary Education and it is considered an extremely important concept when teaching neuron physiology and the nervous system. However, students' understanding of this particular concept implies several difficulties, such as the conceptualization of “local” currents which allow the self-regeneration of an action potential. The purpose of this work is, therefore, to answer the following question: what do Biology students understand by “saltatory conduction”? This aims to identify students' difficulties in order to help us improve our teaching practices. So as to answer this question, a survey with open and closed questions was conducted among first year Biology students from Instituto de Profesores “Artigas”. The results show that, even though students can establish an association among saltatory conduction, myelin sheath and nodes of Ranvier, they understand saltatory conduction in a vague and superficial way. Only few highlighted the importance of an inversion in the membrane potential in the active zone, and even fewer students made reference to the density of the sodium channels in the nodes of Ranvier, or to the local currents. These results cast doubts on whether some students consider the use of the term “saltatory” as literal.

Keywords

action potential, myelin, local currents, teacher training, Biology teaching

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References

  • Agrawal ,P.S.(2010) predict Acoustical and allied property of situated Isoxazole in difft co solvent at 293.15 k. European Journal of Scientific Research ISSN 1450-216X Vol.45 No.3 (2010), pp.470-475 © EuroJournals Publishing, Inc. 2010

 

2)  Thirumaran, S. and George Deepesh, 2009 “Ultrasonic study of intermolecular association through hydrogen bonding in ternary liquid mixtures.” Arpan journal of engineering and Applied sciences. 4(4), PP. 1-11.

3)  Thirumaran, S. and Earnest, J. and Huberd dhanasundaram, B. 2010.

“Molecular interaction studies on N-Alkanols with DMA in toulene at 303 K”E- Journal of chemistry, 7(2), PP. 465-472.

4)  Bhandakkar, V.D., Chimankar, O.P. and pawar, N.R. (2010). “ultrasonic study of    molecular interactions in some bio-liquids.”

Journal of chemical and pharmaceutical Research 2(4), PP. 873-877.

5)  Aminabhavi, T.M. and G. Bindu, 2006. “Densities, Shear Viscosities, Refractive Indices and Speeds of Sound of Bis (2-methoxy ethyl) Ether + n-alcohols at 298.15, 303.15 and 308.15 K”. Indian Journal of Cheimical Technology, 13,pp.149-153.

6)  Pal, A., K.Harish, B.R. Arbad and A.B. Tekzale, 2003. “Ultrasonic Speeds And Isentropic Functions Of Mixtures Of N-Methyl -2- Pyrrolidinone And Branched Alcohols At 298.15 K” Indian Journal of Pure Applied Physics., 41,pp. 113-115.

7)  Pal, A. and A. Kumar, 1998. “Excess Molar Volumes, Viscosities and Refractive Indices of Diethylene Glycol Dimethyl Ether with Dimethyl Carbonate, Diethyl Carbonate and Propylene Carbonate at (298.15, 308.15 and 318.15) K”. Journal of Chemical Engineering Data, 43, pp. 143-144.

8)  Pandey, J.D. A.K. Shukla, N. Tripathi and G.P. Dubey 1993. “Internal Pressure, Ultrasonic Velocity And Viscosity of Multi-Component Liquid Systems” Journal of Physics., 40(2), pp. 81-84.

9)  Pandey, J.D.,V.V. Vyas, J.P. Jain, G.P. Dubey , N. Tripathi and R.Dey, 1999. “Speed of Sound, Viscosity and Refractive Index of Multicomponent Systems: Theoretical Predictions from the Properties of Pure Components” Journal of Molecular Liquids, 81,pp. 123-126.

10) Tamura, K. and A. Osaki, 2000. “Thermodynamic properties of the binary mixtures of cyclohexanone with globular species.” Thermochimica Acta, pp. 352-354.