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What are Stem Cells?

Stem cells are (pluripotent) undifferentiated cells that can differentiate into specialised cell types / tissues. Future medical uses involve growing organs from a patients OWN stem cells = zero chance of re...
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Answered by Sophie P. • Biology tutor
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Explain synaptic transmission at a cholinergic synapse.

A synapse is a gap between neurons that allows communication between different neurons using chemical messengers or neurotransmitters . Let's start simple and describe the basic structure of the synapse; it ...
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Answered by Maaz M. • Biology tutor
9010 Views

Describe how the body maintains homeostasis when there is a drop in body temperature.

The body does this through the process of negative feedback. Thermoreceptors detect the decrease in temperature, and send a signal (via sensory neurones) to the temperature-regulating centre in hypothalamus....
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Answered by Mahima P. • Biology tutor
4136 Views

What does osmosis mean and what does the movement of water do to cells?

Osmosis can be defined as "the movement of water from an area of high water concentration to an area of low water concentration across a selectively permeable membrane". What this means, is that wa...
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Answered by Matilda T. • Biology tutor
12590 Views

Describe the changes that take place to maintain glucose concentration in exercise.

During exercise, blood glucose concentration falls due to the increased energy demand and glucose uptake of skeletal muscles. This fall in glucose concentration is detected by the alpha and beta cells in the...
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Answered by Henry B. • Biology tutor
3398 Views