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Why the human heart is described as a "double pump" and what is the physiological significance of this?

The human heart is described as a double pump because blood passes through it and gets pumped out of it twice in a single circuit of the circulatory system. A normal heart is separated into two halves, right...
JF
Answered by James F. • Biology tutor
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The multi-store model is one theory of memory. Describe two criticisms of the way in which the multi-store model explains how we remember things

The multi-store model of memory has been criticised for placing too much emphasis on the role of rehearsal. Whilst rehearsal is important in moving information from short-term memory to long-term memory, it ...
EP
Answered by Emily P. • Psychology tutor
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Solve the simultaneous equations: 3x+2y=11, 2x-5y=1.

Step 1) Label Equations 1) 3x+2y=11 2) 2x-5y=1 Step 2) Multiply so that one variable has same coefficient in both equations. 1)x5 15x+10y=55 2)x2 4x-10y=2 Step 3) Add/Subtract equations to remove one variabl...
HB
Answered by Harry B. • Maths tutor
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Factorise x^2 + 4x +3

First take the 4x - the two numbers that will be +/- to the x in the brackets will need to add to form this number, so the possibilities are 1 and 3 or 2 and 2.Now take the 3 - the two numbers that will be +...
JS
Answered by James S. • Maths tutor
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How to Solve Two Simultaneous Equations

I will use the whiteboard in order to explain the answer to my question. The format will follow:Understanding what it means to 'solve' one equationUnderstanding what it means to 'solve' two equationsVariable...
MI
Answered by Matthew I. • Maths tutor
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