Evidence that somatic and sympathetic nervous system neurotransmitters, not circulating epinephrine, mediate the immediate responses to a sudden threat in the American alligator (Alligator mississippiensis)
✍ Scribed by deRoos, Roger ;Rumpf, Ronald P. ;Berry, Michael W.
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 947 KB
- Volume
- 250
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
The qualitative and quantitative temporal effects of a 2-min handling stress, both with and without pretreatment with tubocurarine, and the intraaortic infusion of epinephrine, both with and without pretreatment with a combination of phentolamine and propranolol, on plasma lactate, glucose, and hematocrit levels were compared in the American alligator (Alligator mississippiensis). The drugs and epinephrine were administered, and serial blood samples were collected, via a nonocclusive cannula chronically placed in the left aortic arch. Plasma lactate and glucose were measured by standard enzymatic procedures. Plasma lactate rose approximately 92% by the end of the 2-min handling period and to maxima of 1,091 -i-476% greater than the timezero levels by 15 min. The hematocrit also increased rapidly to maxima of 11 * 3.1% greater than