Match the following definition (right) with a term (right) *I have 11, 15 and 19

Question

Match the following definition (right) with a term (right)

*I have 11, 15 and 19 filled out - please double check my answers in addition to answering the rest

J. The transmembrane voltage at which there is no net movement of a particular ion across the cell membrane

11. _G_ Phrenologists A. The effect of a neuro transmitter on a postsynaptic membrane is dependent on this 12. __ Microtubules B. An electrical resistor with conductance that varies linearly with membrane voltage 13. __ Selectivity filter C. Required for axonal transport 14. __ Acetylcholinesterase D. Helps to bring about the end of the synaptic transmission at the neuromuscular junction 15. _I_ Sodium-potassium pump E. An increase in charge difference across a membrane 16. __ Receptor F. The time it takes for a neurotransmitter to diffuse across the syanptic cleft 17. __ Ohmic channel G. Believed bumps on skull reflected highly developed functional areas of brain 18. __ hyperpolarization H. The time it takes for voltage to fall to 37% of steady state value 19. _J_ Equilibrium potential I. Maintains concentration gradient of the two major ions that contribute to the resting potential of a neuron 20. __ Synaptic delay

J. The transmembrane voltage at which there is no net movement of a particular ion across the cell membrane

K. Polar amino acids lining the pore of an ion channel L. Divided the brain into 52 discrete areas based on neuron anatomy

Explanation / Answer

11. G (Phrenologist): Phrenology is the branch of science which deals with psychology and mind and phrenologist Believed bumps on skull reflected highly developed functional areas of brain.

12. C (Microtubules): Axonal transport is driven by molecular motors that run on a polarized “highway” formed by microtubules.

13. K (Selectivity filter): The selectivity filter of an ion channel is a series of polar amino acids which make the pore seletive for particular ion.

14. D (acetylcholinestrase): Acetylcholinestrase is an enzyme which breakdown the acetylcholine molecule and helps to bring about the end of the synaptic transmission at the neuromuscular junction.

15. I (Sodium potassium pump): Sodium potassium pump maintain the concentration of sodium and potassium (two major ions) across cell membrane by pumping three sodium ions out of the cell for each two potassium ion into the cell.

16. A (Receptor): The effect of a neuro transmitter on a postsynaptic membrane is dependent on the receptors to which they interact.

17. B (Ohmic channel): Ohmic channel produces resistance against increase in voltage across membrane.

18. E (Hyperpolarization): The resting membrane potential of a cell is highly negative (almost -70mV). In case of hyperpolarization more potassium ions leave the cells and leave the cell more negative.

19. J (Equilibrium potential): At equilibrium potential net movement across the membrane is zero.

20. F (Synaptic delay): The time it takes for a neurotransmitter to diffuse across the syanptic cleft.

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