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How does muscle contraction take place?

First of all an action potential reaches the end of a motor neuron and the neurotransmitter acetylcholine is then released into the synapse. An action potential is initiated in the muscle cellSarcoplasmic re...
LH
Answered by Laura H. • Biology tutor
2103 Views

Describe the movement of ions, and changes in potential, across the nerve cell membrane during depolarisation and repolarisation.

During depolarisation, sodium ions move into the cell, resulting in the membrane potential rising from -70 millivolts (mV) to +40mV.During repolarisation, potassium ions move out of the cell, and the membran...
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Answered by William P. • Biology tutor
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Describe why organisms may become extinct due to a change in the climate

Organisms may be less well adapted to the changing climate. The organisms will be outcompete by other organisms and it will be harder to them to find food and shelter which are crucial to the organisms survi...
JL
Answered by Jessica L. • Biology tutor
3457 Views

Name 4 organelles within an animal cell

NucleusMitochondriaGolgi ApparatusSmooth endoplasmic reticulum
ZC
Answered by Zoe C. • Biology tutor
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What are the advantages of saltatory conduction?

· The myelin sheath means that action potentials can occur only at the gaps between the Schwann cells that make up the myelin sheath.· Effectively the action potential jumps from one node of Ranvier to the n...
NS
Answered by Natalia S. • Biology tutor
10073 Views