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Describe how low blood water levels are controlled in the human body. (5 marks)

Changes in blood water levels are detected by the hypothalamus through the negative feedback mechanism in homeostasis (2 marks). The pituitary gland releases anti-diuretic hormone into the bloodstream as a r...
RJ
Answered by Rehan J. • Biology tutor
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How do I write a compelling descriptive essay question for English Language paper 1

Often students find the narrative choice in the 40 Mark question to be preferable. However it is possible that the exam will feature a choice between 2 descriptive questions, (therefore omitting a narrative ...
SW
Answered by Samuel W. • English tutor
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What are some of the key features of a red blood cell.

Red blood cells transport oxygen around the body via the circulatory system and are the most common cell in the blood. They carry a special protein called hemoglobin which binds to oxygen, allowing it to be ...
JK
Answered by Jack K. • Biology tutor
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Expand and simplify (x − 4)(2x + 3y)^2

You should start off by separating the brackets as the squared only applies to one of them. We'll deal with that one first. Write the (2x + 3y)^2 as two separate brackets of (2x+3y). Then multiply the first ...
LB
Answered by Lois B. • Maths tutor
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Factorise and solve x^2 - 8x + 15 = 0

Look for factors of 15 then when adding together equal -8. A solution to this is -5 and -3 as -5 x -3=15 and (-5)+(-3)=-8 . Therefore the factors of the quadratic are (x-5) and (x-3). Make (x-5)(x-3)=0 so bo...
AS
Answered by Amrit S. • Maths tutor
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