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Describe the conduction system of the heart and explain how the atria and ventricles contract sequentially.

The heart consists of four chambers, two atria and two ventricle. The conduction system of the heart mediates synchronised contraction of the chambers to allow the heart to effectively pump blood. The conduc...
CS
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Explain the bonding in and the shape of a benzene molecule.

Stage 1 -Bonding 1a) Each C has three (covalent) bonds 1b) Spare electrons (in a p orbital) overlap (to form a pi cloud) 1c) delocalisation Stage 2 -Shape 2a) Planar 2b) Hexagon/6 carbon ring/120o bond angle...
YC
Answered by Yousif C. • Chemistry tutor
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Escribe sobre tus últimas vacaciones. Debes incluir: dónde se alojabas, lo que hacías y lo qué más te gustaba .

En mis últimas vacaciones, fui a españa con mi familia. Anteayer , volvimos del piso en el que nos alojabamos. Todos los días nos relajábamos en la playa. Lo que más disfruté fue la tranquilidad. Si pudiera ...
MB
Answered by Michael B. • Spanish tutor
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Explain (using a sport of your choice) which physiological aids would be most beneficial to a performer.

The most effective physiological aid for a dancer would be cooling aids, these are legal and allow for reduced core body temperature, decreased sweating, dehydration and early fatigue, decreased pain and swe...
Answered by • Physical Education tutor
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(a) Find the set of values of k that satisfy the inequality k^2 - k - 12 < 0. (b) We have a triangle ABC, of lengths AC = 4 and BC = 2. Given that cos B < 1/4 , find the range of possible values for AB:

Solution: Let us consider the function f(k) = k 2 - k -12. Firstly, we want to find out the roots of this function. We calculate the discriminant: Δ = b 2 – 4 a c = 49 hence we get the roots: k 1 = (1-7)/(2 ...
AH
Answered by Alexandru H. • Maths tutor
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