Search over 10,000 free study notes

It can be controlled by hormonal or neuronal (from the nervous system) input. To increase the heart rate, during a fight or flight situation for example, adrenaline may be released from the adrenal glands...

This question can be solved using a tree diagram. First we need to map out the two possible outcomes from the question:

H=heads T= tails. The first scenario is HHH, as the probability of H each tim...

Knowing when to use the preterite or imperfect tense when expressing a past action is one of the trickiest aspects of spanish grammar and can cause confusion for any level of spanish speaker. I always lik...

Tips: When a keyword is mentioned in the question, it is advised to start your answer by defining that keyword or concept (you would usually get a few marks for this) . In this case, star...

An impulse travels along the pre-synaptic neurone, and when it reaches the axon ending it stimulates calcium channles to open on the pre-synaptic membrane. This allows calcium ions to rush into the neuron...