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Why the human heart is described as a "double pump" and what is the physiological significance of this?

The human heart is described as a double pump because blood passes through it and gets pumped out of it twice in a single circuit of the circulatory system. A normal heart is separated into two halves, right...
JF
Answered by James F. • Biology tutor
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Describe what happens when a nerve impulse arrives at a synapse.

A synapse is a junction between a neurone and the next cell. When an action potential arrives at the presynaptic membrane, voltage-gated calcium ion channels open. Calcium ions (Ca2+) diffuse into the synapt...
SG
Answered by Sophia G. • Biology tutor
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What is the function of the cell membrane?

It controls what enters and leaves the cell.
YA
Answered by Yemi A. • Biology tutor
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Describe what happens at a synapse in the human body. (6 marks)

Synapses are the junctions between neurons. An electrical impulse travels down the first neuron and arrives at the presynaptic membrane. The presence of an electrical impulse causes chemicals called neurotra...
EC
Answered by Emma C. • Biology tutor
11317 Views

Cellular structure of the brain

The cellular structure of the brain is a relatively recent discovery and it's Santiago Ramòn y Cajal that recognised it; in addition to this he recognised the neuron as the basic unit. Three main elements ca...
SD
Answered by Sara D. • Biology tutor
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