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Biology
A Level

Describe the ionic basis of an action potential, and how this is reflected on the cell's membrane potential (6 marks)

At rest (steady state) there is a greater concentration of Na+ ions and a smaller concentration of K+ ions on the outside compared to the inside of the cell, and the membrane potential is about -70mV. Upo...

Answered by Konstantinos K. Biology tutor
4366 Views

What causes the heart to contract?

This type of question requires careful explanation and therefore would need to be broken down into chunks. One of the reasons for this is that it may be completely new concepts for students. My answer to ...

Answered by Saajan R. Biology tutor
4085 Views

What is left sided heart failure (mark 1), which organ can it lead to fluid buildup in (mark 2) and why (mark 3)

The left atrium receives oxygenated blood from the lungs via the pulmonary vein (the only vein to pump oxygenated blood) and ejects via the left ventricle to the aorta.Left sided heart failure means that ...

Answered by James P. Biology tutor
2123 Views

How is food absorbed into the blood?

Food is masticated and broken down, to increase its surface area, in the mouth. Particularly, starch is broken down by the enzyme amylase. An enzyme is a biological catalyst that has an active site and is...

Answered by Biology tutor
3500 Views

Describe the processes involved in the absorption of the products of starch digestion

glucose moves in with sodium into epithelial cellvia carrier/channel protein sodium removed from epithelial cell by active transport/sodium-potassium pump into blood therefore maintaining low conc of sodi...

Answered by Mo B. Biology tutor
10170 Views

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