OCR Biology A2 Glossary

Question	Answer
alpha cells	Cells in the islets of Langerhans that release glucagon in response to low blood glucose levels.
Acetylcholine	A neurotransmitter (transmitter substance) found in cholinergic synapses.
Acetylcholinesterase	An enzyme in the synaptic cleft that breaks down the transmitter substance acetylcholine.
Actin	A protein found in muscle cells. It is the main component of the thin filaments.
Action potential	A brief reversal of the resting potential across the cell surface membrane of a neurone. All action potentials have a value 0f +40mV.
Adenyl cyclase	The enzyme found inside cells, associated with hormone receptors, that converts ATP to cAMP.
Afferent	Incoming or leaning towards
Allele	An alternative version of a gene.

Resource summary

	Created by ChloeSutcliffe over 11 years ago