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ID number:577028
 
Author:
Evaluation:
Published: 10.03.2005.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Darba uzdevums.
Novērot dažādu ķīmisko vielu iedarbību uz vardes sirdsdarbību.
Darbam nepieciešams.
Instrumenti vardes preparēšanai, kardiogrāfs, kimogrāfs, Ringera šķīdums, 1% CaCl šķīdums, 1% KCl šķīdums, 0,001% adrenalīna un 0,0001% acetilholīna šķīdumi.
Darba objekts.
Varde.
Darba gaita.
Pagatavo vardes sirds preparātu un pievieno to kardiogrāfam. Uz kimogrāfa cilindra pieraksta kardiogrammu. Turpinot sirds darbības reģistrāciju, sirdij uzpilina 1 pilienu adrenalīna šķīduma. Kad kardiogrammā parādās izmaiņas, sirdi noskalo ar Ringera šķīdumu, līdz sirdsdarbība atjaunojas. Turpinot reģistrēt kardiogrammu, uzpilina KCl šķīdumu. Kad parādās KCl šķīduma izsauktais…

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