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Journal of Experimental Biology 27,50-58 (1950)
Published by Company of Biologists 1950

The Effect of Posterior Lobe Pituitary Extracts on the Blood Pressure of Ornithorhynchus (Duck-Billed Platypus)

M. J. FEAKES 1, E. P. HODGKIN 1, R. STRAHAN 1, and H. WARING 1

1 Zoology Departments of the Universities of Western Australia and Tasmania

1. The carotid blood-pressure response to intravenous injection of histamine-free extracts of mammalian posterior pituitary extracts in the platypus (Ornithorhynchus) is described.

2. Pitressin evokes a simple pressor response.

3. Pitocin evokes a simple depressor response.

4. Mixtures of pitressin and pitocin evoke a fall and a subsequent rise.

5. Histamine evokes a depressor response.

6. A preliminary note is made of the simple pressor response to pitressin and depression to pitocin in the deeply-anaesthetized bird and in a lizard.

7. Comparison is made between the responses to posterior pituitary extracts in reptiles, birds, the platypus and eutheria.

8. The possible phylogenetic significance of these observations is discussed.

Submitted on September 11, 1949






© The Company of Biologists Ltd 1950