Top answers

Describe how an electrical impulse would travel across a synapse.

An electrical impulse arrives at the synaptic knob in the pre-synaptic neuron. This causes the voltage-gated calcium ion channels to open and calcium ions will diffuse into the synaptic knob, down the concen...
EZ
Answered by Ellie Z. • Biology tutor
4391 Views

How are new drugs developed and tested?

When a substance that is found that could be potentially useful for treating a disease, it can be developed into a drug. The drug then needs to be tested to check for safety, efectiveness and dosage. The dru...
GA
Answered by Grace A. • Biology tutor
3383 Views

Outline the typical immune response triggered when a pathogen infects the body

Cells under attack release histamine --> attracts macrophages Macrophage engulfs pathogen into a phagocytic vacuole by phagocytosis Macrophage carries out antigen presentation of pathogenic antigen from c...
GM
Answered by Grace M. • Biology tutor
3371 Views

What is atherosclerosis and how does it occur?

Atherosclerosis is a build up of fat deposits in large and medium sized arteries. This causes narrowing of the blood vessels and can lead to cardiovascular disease. If a plaque ruptures it can cause occlusio...
RW
Answered by Rebecca W. • Biology tutor
4086 Views

Explain how competitive and non-competitive inhibition affects enzymes.

When an enzyme is inhibited it means that the specific substrate that normally fits in the enzymes active site can no longer bind due to the active site having changed shape or having been blocked. Competiti...
ZB
Answered by Zoe B. • Biology tutor
5012 Views