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How is the concentration of blood and urine controlled by the body? (6 marker)

Concentration of urine is controlled by the hormone ADH (anti-diuretic hormone)This hormone is released into the bloodstream; by the posterior pituitary glandIf the water concentration in the blood is too hi...
RA
Answered by Rayyan A. • Biology tutor
4436 Views

y is proportional to x^2. When y=45, x=3. Find a formula for y in terms of x.

If y is proportional to x then you can write y=kx^2 where k is a constant you are trying to find. Then substitute in the values you have been given for x and y. This gives you 45=k(3)^2. Then work to solve t...
AP
Answered by Abbey P. • Maths tutor
19839 Views

What is the difference between the perfect and imperfect tenses in French and when are they used?

There are mainly two tenses used in French to discuss what happened in the past, these being: the perfect and imperfect.However, both of these tenses are used in different ways based on what the speaker inte...
JH
Answered by Joe H. • French tutor
5890 Views

Tu primo español te ha preguntado sobre tus intereses. Escríbele sobre las actividades que te gusta hacer in tu tiempo libre. Menciona: (1) deporte (2) comida (3) familia (4) música (16 marks)

(1) Translate the question: Your Spanish cousin has asked you about your interests. Write to him about the activities that you like to do in your spare time. Mention: (1) food (2) sport (3) family (4) music ...
EH
Answered by Ellen H. • Spanish tutor
3341 Views

Explain how red blood cells are adapted to carry out their function?

Red blood cells transport oxygen from the lungs to all the cells in the body. To do so effectively, they have lots of adaptations: Red blood cells contain haemoglobin , which is a molecule that r eversibly b...
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Answered by Francesca G. • Science tutor
94051 Views