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Describe how a wave of excitation, which originates in the sinoatrial node (SAN) of the heart, eventually results in ventricular systole.

• SAN send a wave of depolarisation/excitation across the atria causing them to contract• wave cannot pass directly to the ventricle, due to the non-conductive tissue of AV-valves• wave reaches the AVN (i...

Answered by Joseph G. • Biology tutor

4610 Views

Which substance is oxidised in the reaction represented by the ionic equation below? Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)

Remember OILRIG for oxidation or reduction reactionOxidisation IsLoss Reduction Is GainSo if Zinc goes from neutral charge to 2+ charge, this means it has lost 2 negative charges in electrons, so as oxida...

Answered by Ned B. • Chemistry tutor

9978 Views

How can I improve for my french oral expression?

Speaking french is not only about grammar and a good structure even if it is indeed important. The facial expression and the "euh" (umh), or "alors" (so) when you are thinking about yo...

Answered by Sarah D. • French tutor

1594 Views

Why did Britain lose the war of American independence?

Identify key factors. Geography, leadership, intervention of France and Spain etc. For first, weak and incompetent military and political leadership meant the British were unprepared to fight a war in 177...

Answered by Henry G. • History tutor

13984 Views

Which time period made most progress made in anatomy? Answer this question in light Renaissance and industrial revolution.

In the renaissance time period Vesalius worked on a lot about Anatomy. He created a book called the Tabulae Sex that included detailed anatomic drawings. Due to the printing press this book called be repr...

Answered by Niloufar N. • History tutor

2087 Views