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Explain how the cardiac muscle controls the regular beating of the heart.

Cardiac muscle is myogenic. This means signals for contraction and relaxation originate from the heart itself. The process is initiated in the sinoatrial node (SAN), located in the right atrium. The SAN is a...
CJ
Answered by Christie J. • Biology tutor
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Solve the following simultaneous equations: 3x + 5y = 19 and 8x - 2y = -18. If both equations represent lines in a coordinate system, at which point do they intersect?

I. 3x + 5y = 19 II. 8x - 2y = -18 . We see that we can simplify the second equation, and we do so: II. x - y = -9. Now, we check to see which variable is the easiest to solve for in the system of equations. ...
NA
Answered by Ninett A. • Maths tutor
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Describe how phagocytic white blood cells destroy bacteria. (4)

The phagocyte recognises antigens on the surface of the bacteria as foreign, causing it to be attracted to the bacteria. The phagocyte then engulfs the bacteria, forming a vesicle around it. Lysozomes fuse w...
SW
Answered by Sarah W. • Biology tutor
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You are told that a straight line runs through 2 points: (1,1) and (2,3). What is the equation of the line?

Recall that all straight lines have the general equation y = mx + c, where m is the gradient of the line and c is the y intercept. First work out the gradient, m, of the line: Gradient = rise/run = (change i...
JP
Answered by James P. • Maths tutor
3539 Views

What is the subjunctive?

The subjunctive is a verbal mode, a way that we can change a verb so that it expresses a certain meaning. Normally we use the indicative mode to indicate something certain or regular, e.g. "Je vais à l'...
DD
Answered by Dora D. • French tutor
2398 Views