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How is the heart beat controlled?

The heart is composed of myogenic muscle and generates its own rate in normal condition. This rate can be modified during increased or decreased respiratory demand. The heart beat is initiated by a group of ...
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Hoy en día, con la tentación universal de la comida basura, mantener una dieta sana resulta imposible. ¿Hasta qué punto estás de acuerdo?

Comer sano hoy en día depende de cada uno. No cabe duda que a cada diez pasos nos topamos con un anuncio de McDonalds o algo parecido. Debido a que la comida está lista en un abrir y cerrar de ojos y los baj...
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Answered by Andrea B. • Spanish tutor
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An airtight compost heap causes anaerobic decay. Explain why the gardener might be against producing compost using this method

Anaerobic decay produces two main gases. Carbon dioxide and Methane. Methane, more importantly, is one of the five greenhouse gases that results in global warming.
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Answered by Jananiy P. • Biology tutor
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A light is shone through a diffraction grating of slit spacing 4.5x10^5 lines per metre. The incident wavelength is 650nm. Find the angle produced by the incident light and the 2nd order maximum.

In the question you are given the slit spacing of the diffraction grate. To find the fringe spacing of this grate you can use d=1/N where N is the slits per metre. In this question this would be 1/4.5x10^5 =...
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Answered by Sarah C. • Physics tutor
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Solve algebraically the simultaneous equations x^2 + y^2 = 25 y – 3x = 13

First begin with rearranging the second equation to put it in terms of Y. Then substitute by putting the second equation (y=3x+13) into equation one as Y^2. Expand (3x+13)^2 and add like terms to form 10x^2 ...
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Answered by Dani L. • Maths tutor
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