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How is a nerve impulse transmitted across a synapse?

A synapse is gap between two neurones. When a nerve impulses travels along the axon reaches the end of the pre-synaptic neurone, the release of chemical messengers (called neurotransmitters) is triggered. Th...
MD
Answered by Marina D. • Biology tutor
13958 Views

Express 4 sin(x) – 8 cos(x) in the form R sin(x-a), where R and a are constants, R >0 and 0< a< π/2

4 sin(x) – 8 cos(x)= Rsin(x-a) here use double angle formula 4 sin(x) – 8 cos(x)= Rsin(x)cos(a)-Rcos(x)sin(a) Rearrange so in same format as LHS 4 sin(x) – 8 cos(x)= Rcos(a)sin(x)-Rsin(a)cos(x) Equate terms ...
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Answered by Simon E. • Maths tutor
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The line L has equation y = 5 - 2x. (a) Show that the point P (3, -1) lies on L. (b) Find an equation of the line perpendicular to L that passes through P.

(a) To confirm that point P lies on L, we must substitute x = 3 into the equation and see if we get y = -1. y = 5 - 2(3) = -1, therefore P lies on the line L (b) The gradient of the perpendicular line is -1/...
KS
Answered by Kitty S. • Maths tutor
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Discuss hazard mitigation mechanisms developed for different threats posed by volcanoes (40 marks)

Across the globe, the theory of plate tectonics and evidence of shallow Earth structure processes has enabled scientists to determine the variety of hazards cause by different eruptive styles. Volcanoes pose...
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Answered by Daniel V. • Geography tutor
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Why is phenylamine a weaker base than ethylamine?

Phenylamine is a weaker base than ethylamine because the lone pair on the nitrogen atom in phenylamine is spread into the delocalised electron ring in benzene, therefore is less available for protonation tha...
AJ
Answered by Adam J. • Chemistry tutor
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