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When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the presynaptic knob. Describe how.

A nerve impulse is an electrical current that is transmitted down the axon of a neurone and to the synaptic knob. The impulse depolarises the membrane and causes a change in voltage across the membrane. T...

Answered by • Biology tutor

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Evaluate the extent to which the process of selecting presidential candidates is deeply flawed

The primary process is criticised for being undemocratic due to the amount of power elites have in it. Staggered primaries are also criticised as they over exaggerates the importance of unrepresentative s...

Answered by Alicia B. • Politics tutor

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¿Qué te gusta hacer en tu tiempo libre?

This question is to help with the speaking exam for GCSE. It is a very common question asked by examiners as it allows the student to show off vocabulary that they have learnt and allows different tenses ...

Answered by • Spanish tutor

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A circle has equation: (x - 2)^2 + (y - 2)^2 = 16. It intersects the y-axis (y > 0) at point P and the x-axis (x < 0) at point Q. Find the equation of the line connecting P and Q and of the line perpendicular to PQ passing through the circle's centre.

(x - 2)² + (y - 2)² = 16 x = 0 --> 4 + (y - 2)² = 16 --> y - 2 = ±2sqrt{2} --> y = 2 ± 2sqrt{2} --> P(0,2 + 2sqrt{2})y = 0 --> (x - 2)² + 4 = 16 ...

Answered by • Maths tutor

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Show that (x + 1)(x + 2)(x + 3) can be written in the form ax3 + bx2 + cx + d where a, b, c and d are positive integers.

(x + 1)(x + 2) = x^2 + 2x + x + 2 = x^2 + 3x+2therefore(x + 1)(x + 2)(x+3)= (x^2+3x+2)(x+3) = x^3 + 3x^2 + 2x + 3x^2 + 9x + 6 = x^3 + 6x^2+ 11x + 6where a=1 b=6 c=11 and d=9expansion of brackets can be do...

Answered by Jeremy T. • Maths tutor

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