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Why do nerve impulses travel faster in myelinated neurons?

The myelin sheath is a fatty layer made up of the hugely expanded plasma membrane of schwann cells which surround the axon of neurons. The axon is unprotected where the sheath of one cell meets the next and ...
DP
Answered by Dolcie P. • Biology tutor
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Deduce a formula (in terms of n) for the following sum: sum (2^i * i) where 1<=i<=n, n,i: natural numbers ( one can write this sum as: 1*2^1+ 2*2^2+ .. +n*2^n)

Let S = sum i* 2 i (i=1,2..n) We multiply this by 2 and we obtain:2S = sum (i 2 i+1 ) = sum [(i+1-1) * 2 i+1 ]= sum[ (i+1) 2 i+1 ] - sum 2 i+1 i=1,2..n ( ) sum (i+1) 2 i+1 = 2 2 2 + .. n 2 n + (n+1)* 2 n+1 =...
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Answered by Alexandru S. • MAT tutor
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How should I approach writing a personal statement?

The key to writing a personal statement is to make it personal. Avoid using flowery language that you wouldn't use in everyday life, keep it professional sounding but make sure its your own voice. Make sure ...
ES
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How does long shore drift work?

Long shore drift is the process by which sediment is moved along a beach in the direction of the prevailing wind. Sediment is sand, gravel and other small particles that make up a beach and seabed. The preva...
ES
Answered by Ella S. • Geography tutor
6014 Views

Escríbe un mensaje a tu amigo español. Menciona algo que hiciste recientemente que fue muy divertido y qué haces para mantenerte en forma.

¡Hola amigo! ¿Cómo estás? Tengo que decirte, la semana pasada, tuvo una experiencia inolvidable. Mis amigos y yo fuimos a un festival en el parque para celebrar los artistas musicales jóvenes que han tenido ...
CA
Answered by Chrystine A. • Spanish tutor
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