Search our library of homework questions

Top answers

All subjects

All levels

Describe and explain how blood in the right ventricle travels to the left atrium.

The muscle of the right ventricle contracts. This forces the {right atrio-ventricular/tricuspid} valve to close and the {right semi-lunar/pulmonary} valve to open. The blood is pumped through the pulmonar...

Answered by David A. • Biology tutor

6369 Views

How accurate is it to say that, in the years 1852–67, the most significant factor driving parliamentary reform was campaigning by the Reform League?

Introduction- Bring in your answer to the question, and explain the structure of your essay briefly. How is significance measured in your answer?POINT- Reform League (start with the named factor an...

Answered by • History tutor

2889 Views

When propanal is reacted with potassium cyanide under weakly acidic conditions the resulting mixture does not rotate plane polarised light. Explain this observation.

A common mistake is to answer this question with the explanation that the light is not rotated because no optical isomers are present. However, this is incorrect. The only other time where plane polarised...

Answered by Sally D. • Chemistry tutor

4471 Views

Explain the stages of an ECG trace.

The P wave is caused by the contraction of the atria, forcing the blood into the ventricles. The sinoatrial node, produces a wave of depolarisation which causes the atria to contact and therefore the p w...

Answered by • Biology tutor

3185 Views

For the function f(x) = 4x^3 -3x^2 - 6x, find a) All points where df/dx = 0 and b) State if these points are maximum or minimum points.

Part a) requires you to find df/dx for the given function. To do this, we differentiate the function once, which is done by multiplying the power of each 'part' with the part itself and subtracting 1 from...

Answered by Martin M. • Maths tutor

3666 Views