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How can one remember the function and the anatomy of the cardiac valves?

There are 4 cardiac (from the Greek 'καρδία', meaning 'heart') valves. Physiology (Function) - The pulmonary and aortic valves prevent the backflow of blood from the pulmonary artery and aorta into the ventr...
AH
Answered by Ariadne H. • Biology tutor
9560 Views

What is the difference between breathing and respiration?

It is understandable why there is confusion between the two terms as we use the term 'respiratory system' to refer to the lungs and associated structures, even though they are not directly involved in the pr...
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Answered by Ariadne H. • Biology tutor
4102 Views

A ladder 6.2m long is leaning against a wall. The bottom of the ladder is 0.8m from the wall. Calculate the distance the ladder reaches up the wall, giving your answer to two decimal points.

Using the information given, we can draw a diagram of the ladder leaning against the wall. As the wall is at 90 degrees to the ground, we can see that the ladder, wall and ground form a right-angled triangle...
PF
Answered by Pippa F. • Maths tutor
11943 Views

How does temperature affect enzyme activity?

A low temperatures enzyme activity will be slow but as the temperature rises the enzyme will gain more kinetic energy and hence move around more enabling greater interaction with the substrate. This will res...
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Answered by Amelia W. • Biology tutor
15433 Views

Find the two solutions to the quadratic equation x^2-9x+18

The constant 18 can be written in the form 3*6. Therefore the brackets will take the form (x 3)(x 6). In order to find the sign in between them, we have to write -9 using 3 and 6. -9=-3-6 so the brackets are...
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Answered by Felix A. • Maths tutor
5877 Views