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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 (in t...
JG
Answered by Joseph G. • Biology tutor
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Some plant cells contain the polymer starch. Explain how the structure and properties of starch are related to its function as a storage molecule.

Starch is a polymer of the sugar glucose, an important component of respiration and needed to provide plants with energy. Unlike glucose, starch is insoluble allowing it to be stored within the cell without ...
DC
Answered by Daire C. • Biology tutor
9875 Views

What cells and in what order take part in the imune response?

https://www.bitpaper.io/go/Tara%20Cell%20recognition/H1OQMML-N
TG
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Explain the flow of blood through the heart and label the diagram (of the heart and its chambers)

The heart has 4 main chambers; the right and left atrium, and the right and left ventricle. Each receive blood and pump blood from and to different parts of the body. The right atrium receive de-oxygenated b...
TB
Answered by Tasnima B. • Biology tutor
6994 Views

Describe how a phagocyte defends the body

The phagocyte is attracted to a pathogen, the pathogen binds to the phagocyte and then the phagocyte engulfs the pathogen. The pathogen is then contained in a phagosome which has been cleaved off the membran...
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Answered by George G. • Biology tutor
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