Top answers

Biology
GCSE

What is a reflex arch?

Reflex arch is a neural pathway that controls a fast, involuntary reflex. The pathway is as follows: 1)Receptors detect a stimuli such as fire or a neddle pricking your finger. 2) Nerve impulses from the ...

MR
Answered by Momna R. Biology tutor
7793 Views

What is ventilation of the lungs and how does it occur?

Ventilation means moving air into and out of the lungs. This depends on a number of factors which we can break down and talk about individually.

The structure of the thorax: An airtight space in th...

RW
Answered by Rebecca W. Biology tutor
5548 Views

I'm not sure how to answer the longer-answered questions e.g. those that are 6 marks.

This is a really common question that people ask actually and I struggled with this when I did GCSE. It's a good idea to jot down the points you want to include whilst you're learning how to answer these ...

LB
Answered by Laura B. Biology tutor
2854 Views

Describe how a synapse works to transmit a nervous impulse from one neuron to another neuron.

There is a pre-synaptic and post-synaptic neuron. An impulse stimulates the presynaptic neuron, travelling down to the synaptic bouton. This releases neurotransmitters into the synaptic cleft, which diffu...

SG
Answered by Steph G. Biology tutor
2900 Views

Strains of the bacterium Staphylococcus aureus have developed which are resistant to several types of antibiotic. Scientists have named these strains MRSA. These strains have developed as a result of...?

The answer is natural selection.  you have a colony of the bacterium and one bacterium develops a mutation which allows it to become resistant to some types of antibiotics. the bacteria that dont have the...

SS
2316 Views

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