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Posters & Jigsaws since 2004
Home > All Images > 1999 > February

February Gallery

Choose from 268 pictures in our February collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Helmsley Castle K990252 Featured February Print

Helmsley Castle K990252

HELMSLEY CASTLE, North Yorkshire. View of the 12th century east tower in the snow

© Andrew Tryner

Cold, Defence, Fortification, Medieval, Snow, Tower, Winter

Nerve synapse Featured February Print

Nerve synapse

Synapse. Illustration of a synaptic knob (at left), the junction between two nerve cells. When an electrical impulse reaches the synapse, vesicles (round blue shapes, lower left) burst through the cell membrane (exocytosis). They then release chemicals called neurotransmitters (red spheres). These cross the synaptic cleft, the gap between the two cells. When they reach the receptor cell they will bind to the cell. There they will trigger an electrical impulse in the receptor cell. Information is transmitted along the nervous system in this manner. The green, cigar-shaped structures are mitochondria, the sites of energy production within the cell

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY