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What events occur during the cardiac cycle?

Within the heart the atria contract creating a high pressure and squeezing blood into the ventricles. The semi lunar valves are closed so pressure within the ventricles builds up.Pressure within the ventricl...
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Answered by James H. • Biology tutor
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Describe how negative feedback is used to control blood glucose concentration (6 marks)

Throughout your answer to this question make sure that you are cramming as much key language into it as possible! Phrases like 'islets of Langerhans', 'beta/alpha cells', and 'transporter proteins' will all ...
MH
Answered by Matt H. • Biology tutor
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How does a deletion of a base in the DNA base sequence lead to a mutated protein?

It is important to note that bases on the DNA (and mRNA) are read in separate sets of 3s along a DNA/(mRNA) stand (this is called a triplet code in DNA, or the codon in mRNA). So, if a base is deleted, the w...
FS
Answered by Febi S. • Biology tutor
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What are the events in the cardiac cycle?

The cardiac cycle is the series of events that leads to blood being pumped to the lungs and around the body. The cycle begins with the SAN (sino-atrial node). This is the hearts 'pacemaker'. It sends out a n...
TC
Answered by Thomas C. • Biology tutor
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What is magnification of a microscope vs. the resolution?

Magnification The magnification is how much bigger a sample object appears under the microscope than it does in real life. Sometimes the total magnification may depend on the value the object lens has magnif...
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Answered by Sophie S. • Biology tutor
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