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by Jeanette Engqvist
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Electrical conduction system of the heart. Computer illustration showing the impulse conduction system (yellow) and nodes (bulb-shaped, yellow) of... more
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Electrical conduction system of the heart. Computer illustration showing the impulse conduction system (yellow) and nodes (bulb-shaped, yellow) of the human heart. The sinoatrial (SA) node's (upper left) self-excitatory muscle cells trigger an impulse that spreads through the heart's upper chambers (atria) to the atrioventricular (AV) node (centre left). Contraction of the atria causes blood to move into the heart's lower chambers (ventricles). Nerve extensions (yellow, forked, bottom) via the bundle of His cause the ventricles to contract, sending blood to the lungs and to the rest of the body.
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