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Describe the pathway of electrical activity in the heart during the cardiac cycle.

The wave of excitation originates in the sinoatrial node in the right atrium. From there, it travels through the right and left atria, causing contraction of the atria (atrial systole). It is prevented from ...
JW
Answered by Josh W. • Biology tutor
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What happens in the light dependent reaction in photosynthesis?

Background Photosynthesis is the process where energy from light is used to break apart bonds in water . Hydrogen from water is then combined with CO2 to form glucose which is stored in the plant as a fuel f...
HW
Answered by Hannah W. • Biology tutor
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Describe the polymerase chain reaction

The first step of PCR requires the target gene to be located using primers. Primers are short nucleotide sequences that are the complementary to either side of the target gene. The DNA sample containing the ...
TT
Answered by Tolu T. • Biology tutor
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Explain how applying increasing pressure to a Pacinian corpuscle produces a larger change in membrane potential.

When pressure is applied to a Pacinian corpuscle the membrane is distorted, opening the stretch-mediated Na+ channels. This then allows Na+ ions to move in down their concentration gradient which increases t...
MC
Answered by Madeleine C. • Biology tutor
13330 Views

How does the structure of glycogen relate to its function?

Glycogen is a polysaccharide with many branches, these branches increase the available surface area for enzymes to hydrolyse the substrate. glycogen is used as a storage of glucose which allows for fast ener...
JG
Answered by Jack G. • Biology tutor
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