. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BF(W1). 1min Figure 4. Bioassay of body fluid using the posterior cardioarteriai valve of the lobster. The body fluid (BF) was collected from the leg. Each of the perfusate samples (BF, 2 ml) was applied to the valve (bars) while tension of the flap muscle was measured, (a) A typical response of the valve to the BF before cooling (W2). (b) The response to the BF during the first phase of cooling (CD. (c) The response to the BF during the late phase of cooling (C2). (d) The response to the BF during the initial phase of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BF(W1). 1min Figure 4. Bioassay of body fluid using the posterior cardioarteriai valve of the lobster. The body fluid (BF) was collected from the leg. Each of the perfusate samples (BF, 2 ml) was applied to the valve (bars) while tension of the flap muscle was measured, (a) A typical response of the valve to the BF before cooling (W2). (b) The response to the BF during the first phase of cooling (CD. (c) The response to the BF during the late phase of cooling (C2). (d) The response to the BF during the initial phase of rewarming (Wl). (e- f) Two examples of the valve response to octopamine (OA, 2 ml). tagonist of octopamine, blocked the rapid relaxation of AV (not shown in figure). The relaxing activity of the samples obtained just after the onset of cooling was com- parable to that of 10 7 M octopamine (Fig. 5b, c). Discussion The anatomical features of the ligamental nerve plex- uses (Fig. la) are almost identical with those of P. inter- niptus (Sullivan ci <;/., 1977). Axons in the ligamental nerves come from the thoracic ganglia via root 3. The firing pattern of the ligai ntal nerves and root 3 in re- sponse to cooling was similar (Figs. Ib and 2a). Similar responses of the root 3 haw also been observed in the ganglia isolated completely from the thorax of lobsters and shrimps (unpub. data). The response of the ligamental nerve to cold stimulation occurred following a delay of 20 s. This is at least 5 s longer than the corresponding delay recorded in the proximal part of root 3 (<15 s). However, if the cold receptors were in the ganglia. 5 s might be sufficient to account for the time required for the cold saline perfusing the pericardium to arrive in the thoracic ganglia, and the time for neural conduction from the ganglia to the ligaments under the low temperature. Judging from the cardiac outflow, the latency of 5 s is reasonable (Spaargaren, 1974). The cool- ing-dependent firin
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
