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What is the link between electrical activity of the heart and its contraction?

The electrical current is produced in the SA node (the primary pacemaker of the heart) and travels to the AV node via fibres in the walls of the atria. These impulses cause the muscular walls of the atria to...
SM
Answered by Stephen M. • Biology tutor
7137 Views

Can you explain the oxygen dissociation curve.

What is the graph telling us? On the graph, we can see two axes. We have partial pressure of oxygen on the X axis and Hb saturation on the Y axis. Partial pressure is another way of saying how much oxygen th...
TK
Answered by Thomas K. • Biology tutor
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Shakespeare's King Lear is a study of brutality, not only of human beings, but also of the natural world. Evaluate this view of King Lear.

In King Lear, Shakespeare uses many literary techniques such as metaphor to paint a picture of his characters' behaviours. These techniques often use nature such as dangerous animals or extreme weather to sh...
NH
Answered by Nicole H. • English tutor
2892 Views

Describe the process of breathing

The diaphragm contracts, moving downwards. The external intercostal muscles contract, and the internal intercostal muscles relax. Pressure in the chest cavity decreases, forcing air into the lungs. The diaph...
AC
Answered by Ailin C. • Biology tutor
3239 Views

How do you make f the subject of the following a = c/d + e/f

1)Multiply out the right hand side to give a common denominator: a= (Cf+de)/df2) Cross multiply to get rid of the denominator fda = cf + de3) bring all terms containing f to the same side and factorise fda -...
KD
Answered by Kwaku D. • Maths tutor
3691 Views