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Explain how FHS and oestrogen illustrate the principle of negative feedback during the menstrual cycle, and explain therefore why oestrogen may be used as a contraceptive.

FHS is released from the anterior pituitary gland in the brain and causes the follicle to develop in the ovary. the developing follicle produces and secretes oestrogen. This release of oestrogen stimulate...

CP
Answered by Catrin P. Biology tutor
3613 Views

Why does the chain rule work?

One of the best ways to view dy/dx is as a fraction. When we have y=f(g(x)), we need to make a substitution u=g(x) to find dy/dx. This leaves us y=f(u) and u=g(x). Differentiating said terms leaves us wit...

SV
Answered by Sam V. Maths tutor
3076 Views

How do we factorise?

The general form of factorising is that if we have ab+ac, we can rewrite this as a(b+c). We multiply each statement inside the bracket by a. So we’re effectively ripping out common terms. We are dividing ...

SV
Answered by Sam V. Maths tutor
2911 Views

Separate (9x^2 + 8x + 10)/(x^2 + 1)(x + 2) into partial fractions.

First, we find the form of the two fractions we're going to get. As one denominator has a power of 2, and the other a power of 1, our answer will be of the form: [(Ax+B)/(x2+1)] + [C/(x+2)]. If...

LU
Answered by Laura U. Maths tutor
4404 Views

Describe the ways energy can be transmitted through a substance?

Conduction, where particles within a conductor gain energy as they heat up and vibrate more vigorously passing energy onto adjacent particles as they collide. Convection, which only occurs in fluids, as f...

AL
Answered by Alex L. Physics tutor
2144 Views

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