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Please can you explain what a heart attack is and how it can occur?

The heart is an organ made of muscle in the centre of the chest. It's role is to pump oxygenated blood around the body to enable our functions to be carried out. During a heart attack, a section of the heart...
VG
Answered by Vijay G. • Biology tutor
3455 Views

Discuss the reactivity benzene, chlorobenzene, toluene and phenol in electrophillic aromatic substitution

Phenol > Toluene > Benzene > Chlorobenzene. The reactivity of the ring is dependant on how electron rich it is, as this determines the extent to which the (positively charged) electrophile can attac...
JM
31594 Views

Find the number of solutions x in [0,2pi) to the equation 7sin x +2(cos x)^2 =5.

The problem seems to be hard as the equation involved both cosx and sinx But we can relate the two as (cosx)^2 + (sinx)^2 = 1, so we can rearrange this as 0 = 2(sinx)^2 - 7sinx + 3. This quadratic in sinx ha...
JR
Answered by James R. • MAT tutor
3263 Views

Explain how SSRI's ares used in the treatment of depression.

SSRIs or selective serotonin reuptake inhibitors can be used to treat depression. They are used as they inhibit the reuptake of the neurotransmitter, serotonin, in the presynaptic cell. This increases the le...
TS
Answered by Tiff S. • Psychology tutor
2419 Views

what is the correct word order for a sentence in chinese?

The basic word order is: person (+ time) (+adverb) (+ place) (+negation) (+ modal verb) + verb (+ duration) + object where you can leave out the things in brackets： Some examples 我在花园喜欢踢足球 I like to play foo...
DR
Answered by Daniel R. • Mandarin tutor
2786 Views