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The histology of the giraffe’s carotid, functionally considered

Through the courtesy of Dr Chalmers Mitchell and Dr Vevers, and the facilities kindly afforded by Dr Scott and Dr Beattie, one of us had recently the opportunity of examining the carotid artery of a young giraffe at the Zoological Gardens. The object in view was to find out what structural mechanism existed for overcoming hydrostatic pressure in blood vessels, and the neck vessels of the giraffe seemed most likely to give the answer. The intermittent output of the heart,

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Blood flow and pressure in the giraffe carotid artery

1. Carotid artery blood pressure and blood flow were measured and telemetered from wild giraffes ranging freely on the African plains. 2. The blood pressure ranged between 260/160 mm Hg when the animal was lying flat, and 120/75 mm Hg when it was standing upright; dp/dt at the onset of systole was 1500 mm/sec. 3. Peak systolic blood velocity measured at the same site was 60 cm/sec; during diastole velocity remained above 40 cm/sec. Calculated blood flow in the carotid

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The structural organization of the carotid arterial system of the giraffe (Giraffa camelopardalis)

Carotid arteries in the giraffe were removed and their structural organization studied with light microscopy. It has been shown that the carotid artery has a largely muscular structure in the adult except for the carotid baroreceptor area located at the carotid‐occipital junction. The fetus carotid has an elastic structure in its caudal portion and a musculo‐elastic structure in its cranial portion. It is proposed here that the muscular structure of the carotid arterial system constitutes part of the structural mechanism

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