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How is the lung adapted for gaseous exchange?

The lung consists of one cell thick bronchioles , which feed into round structures called alveoli , which are round in shape and also one cell thick. The bronchioles and alveoli are surrounded by capillaries...
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Answered by Thomas D. • Biology tutor
11426 Views

A curve is defined by the parametric equations x = 3 - 4t, and y = 1 + 2/t. Find dy/dx in terms of t.

At first glance, this looks quite tricky, as usually when we are asked to find dy/dx, we have one equation, but here we have 2.So in this case, we need to use the statement that dy/dx = (dy/dt) * (dt/dx)Then...
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Answered by Wesley M. • Maths tutor
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What is the integral of (6x^2 + 2/x^2 + 5) with respect to x?

When we think of integration, we should be thinking of the same method every time; adding one to the power, and then dividing by that new power.The integral of the sum of each of these terms is equal to the ...
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Answered by Wesley M. • Maths tutor
8685 Views

Evaluate the view that religious beliefs and organisations are barriers to social change. (20 marks)

This question requires students to present theories/ perspectives that argue that religion prevents social change or maintains how things currently are in society. Students should first address the view in t...
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Answered by India P. • Sociology tutor
24597 Views

What is clonal selection?

Clonal selection is a part of human immune response where specific B or T-helper lymphocytes are chosen to undergo clonal expansion B-lymphocytes and T-helper lymphocytes have unique and specific antigen rec...
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Answered by Oliver M. • Chemistry tutor
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