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Describe the cardiac cycle

Diastole - relaxation of the atria and ventricles means lower pressure within the heart, this causes blood to passively flow through the atria and into ventricles. AV valves are open therefore allowing blood...
BC
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How do I form a question?

There are two formulas for creating a question in french. The first is adding "est-ce que" to the begining of the statement. Therefore the equation is, "est-ce que" + the subject + the ve...
MT
Answered by Megan T. • French tutor
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What is osmosis?

Osmosis is the movement of water molecules through a partially permeable membrane. Water molecules move from a region of of higher concentration to an area of lower concentration. When concentration is equal...
MT
Answered by Megan T. • Biology tutor
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Determine the first derivative of the following curve defined by parametric equations x = 20-5t and y = t^5.

First remember that a parametric curve z = (x(t), y(t)) can be differentiated using the following formula (derived using the chain rule): dz/dt = (dy/dt)/(dx/dt). We should now find dy/dt and dx/dt (which ar...
FC
Answered by Federico C. • Maths tutor
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When should I use the subjunctive?

The subjunctive is used to express desires, wishes, uncertainties, possibilities and doubts. For example, in Spanish when you wish to say 'I don't think it is sunny', you would use the subjunctive (No creo q...
MO
Answered by Matilda O. • Spanish tutor
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