Vascular system of the giraffe

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An allometric analysis of the giraffe cardiovascular system.

There has been co-evolution of a long neck and high blood pressure in giraffes. How the cardiovascular system (CVS) has adapted to produce a high blood pressure, and how it compares with other similar sized mammals largely is unknown. We have measured body mass and heart structure in 56 giraffes of both genders ranging in body mass from 18 kg to 1500 kg, and developed allometric equations that ...

Circulation of the giraffe.

T H E long neck of the giraffe presents a unique problem in the regulation of the systemic arterial blood pressure and in the maintenance of the cerebral circulation. In 1954, Goetz and Budtz-Olsen succeeded in measuring the arterial blood pressure in a standing, unanesthetized giraffe. 1 ' 2 In this animal, approximately 13 feet tall, the carotid arterial mean pressure was found to be 200 mm. ...

The Height of a Giraffe *

A minor modification of the arguments of Press and Lightman leads to an estimate of the height of the tallest running, breathing organism on a habitable planet as the Bohr radius multiplied by the three-tenths power of the ratio of the electrical to gravitational forces between two protons (rather than the one-quarter power that Press got for the largest animal that would not break in falling o...

About Myths and Facts in the Cardiovascular System of the Giraffe About Myths and Facts in the Cardiovascular System of the Giraffe