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Explain how blood glucose concentration is controlled in the body

When high levels of glucose in the blood are detected, insulin is released from beta cells in the islets of Langerhan in the pancreas.Insulin then binds to insulin receptors of cells, which causes an increas...
HH
Answered by Hannah H. • Biology tutor
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During large heart attacks the chordae tendineae can be damaged. Use your knowledge of the heart’s structure and the diagram below to to explain how damage to these structures may lead to backflow of blood from the right ventricle to the right atrium.

The heart is a muscular pump. It can be divided into 4 chambers: 2 atria and 2 ventricles. Each atrium is connected to its ventricle by a small opening. This opening is covered by a valve, which guards the e...
EM
Answered by Eleanor M. • Biology tutor
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Explain the cell cycle

The cell cycle is divided into interphase and mitotic phase (and cytokinesis ). Interphase occupies most of the cell cycle (90% in mammals) and can be referred to as the 'resting phase' as no division takes ...
TJ
Answered by Tamanna J. • Biology tutor
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What causes the different peaks on an ECG?

the heart is myogenic - meaning it can carry an electrical impulse without the use of neurons. This signal causes contraction of the different cardiac chambers it passes through. The ECG, or electrocardiogra...
Answered by • Biology tutor
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Explain what is meant by temporal and spatial summation in the context of synapses.

Context : We often think of a linear model of one pre-synaptic neurone linking up with one post-synaptic neurone. In reality, the nervous system is a large network, many pre-synaptic neurones may terminate a...
BK
Answered by Bethany K. • Biology tutor
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