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Pandalus borealis; habitats; heart rate; muscles; oxygen consumption; shrimp; temperature
Abstract:
... Whereas in some genera of marine decapod crustaceans the scaphognathite and heart rates of species from English waters are no faster than the rates for other species of the same genera living in arctic waters, each measured at their natural temperatures, in other genera the rates for the English species are faster than those for the arctic species. The prawn Pandulus montagui attains a larger size ...
Crustacea; Polychaeta; ambient temperature; animal adaptation; body size; geographical variation; heart rate; latitude; metabolism; shrimp; British Isles; Mediterranean Sea
Abstract:
... The blood‐vessel pulsations of the polychaete worm Perinereis cultrifera are adapted to environmental temperatures in that the rate for animals living in English waters is the same at 14d̀ as that for Mediterranean animals at 20d̀. At a given temperature the rate for the northern form is quicker than that for the southern form, in spite of the fact that the northern animals are considerably bigger ...
... Physiological factors such as body surface temperature, electrical conductivity of the skin, rate of sweating, total sweat cost, and heart rate were measured as criteria for evaluating in warm and hot environments the comfort afforded human test subjects by textile apparel. To correlate the physiological parameters with individual impressions of comfort and to assess the contributing psychological ...
... The effects of temperature upon oxygen consumption, heart rate, breathing rate, and evaporative water loss of resting alligator lizards. (Gerrhonotus multicarinatus) were analyzed. The Q₁ ₀ for oxygen consumption remains constant at 3.1 between approximately 4°C and the upper level of thermal tolerance for this species, 39°—40°C. That for heart rate remains 2.3 between 10° and 39°—40°C, increasing ...
... Detailed procedures are presented for denervation of the American cockroach heart, Periplaneta americana L., by removal of the lateral cardiac nerve cords. Results of bioassay with the innervated heart are also presented and compared to responses obtained from identical assay conditions with the denervated heart. The response of the innervated heart to 10⁻³ M sodium azide, slight changes in the co ...
... Stimulation of the segmental nerve bundle of the American cockroach, Periplaneta americana caused a short increase in heartbeat rate of the isolated heart. The amount of rate increase was related sigmoidally to the stimulation frequency. Very low frequency stimulation of the segmental bundle caused initial slowing of the heartbeat rate. The cardio-accelerating property of cockroach blood and of la ...
... The method described is indirect but atraumatic and can be used with conscious or anaesthetised rats. An occluding cuff is fitted at the base of the tail and pumped up until flow signals from the caudal artery, detected by a Doppler ultrasonic flowmeter, disappear. The cuff pressure at this point corresponds to the systolic pressure. Heart rate and any flow pulse irregularities may be observed at ...
... 6-lead (3 standard, 3 augmented) electrocardiograms were recorded from 150 captured African baboons being used as undosed controls in toxicity studies. The animals, of 14 months to 2 years of age, were unanaesthetised and restrained supine. Analysis of lead II revealed a heart rate of 230±46 beats/min, P-R interval of 0.07±0.02 s, QRS 0.03±0.02 s, Q-T 0.16±0.03 s, and component wave-form amplitude ...
... Electrocardiograms were recorded for 50 Finnish reindeer of age 1 day to 9 years, using standard and unipolar extremity leads in the frontal plane. The range of heart rate was 40–250 beats per minute. Atrial and ventricular depolarization times were 5–10 ms shorter in newborn calves than in older reindeer, and showed only minor variance with respect to heart rate. The duration of depolarization wa ...
... SUMMARY Thirty‐one horses competing in a 100 kilometre endurance ride had electrocardiograms recorded before and after the ride from which the heart score of each horse was calculated. Blood was also taken to determine the packed cell volume (PCV) and total plasma protein (TPP) before the ride, after 60 kilometres (mid‐ride) and at completion of the ride. Statistical analysis of the heart scores s ...
... The resting heart rate was monitored in SO urethane-anaesthetized (387 ± 54 beats/min) and 4 conscious (341 ± 39 beats/min) ferrets. The arterial blood pressure in the anaesthetized animals was 140/110 ± 35/31 mmHg. The circulatory responses to vagal stimulation, carotid artery occlusion and a variety of humoral agents were examined. The vagal innervation of the heart and of the distribution of th ...
... The blood pressure measured directly in the distal part of the central ear artery is dependent upon the degree of vasodilation of the vessel, and exhibits spontaneous variation. This variation is abolished by hexamethonium in doses which had only a minor, transient hypotensive effect. While the degree of ganglionic block could not easily be quantitated, stability of peripheral arterial pressure an ...
... Heart rate (HR), body temperature (BT) and locomotor activity (LA) were measured continuously over 5 days in freely moving rats. In addition to the well-known circadian rhythms, all variables exhibited considerable fluctuations in amplitude mainly during the dark, but also in the light periods. The values of HR varied from 286 ± 12 to 470 ± 26 b.p.m. and BT from 36·15 ± 0·15°C to 38·45 ± 0·25°C. T ...