File-016 - BIO 119 File-016 McCague Experiment IV A. Effect...

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BIO 119 McCague File-016 Experiment IV A. Effect of temperature in the rate of a biological process. Temperature is one of the important variables affecting animate and inanimate processes alike. In the present experiment the effect of temperature on a beating frog heart may give you some insight into the relation between temperature and speed of reaction. Materials: 1. 250 to 400 m. beaker (2) 4. Ice cold Ringer’s Solution 2. Ring stand, etc. 5. Frog’s Ringer’s Solution 3. Dissecting instruments (room temperature) Experimental procedure: Pith the brain and spinal cord of a frog and expose the heart. Be sure to keep the tissues irrigated with Ringer’s Solution to prevent drying out and deterioration. Remove the pericardium a thin whitish membrane surrounding the heart, and identify: a single muscular ventricle, 2 lateral thin walled auricles, and the large blood artery known as the bulbus arteriosus. Lift the tip of the ventricle so that you can observe the dorsal side known as the frenum. Cut this with the scissors and tip the heart forward. You will see a triangular chamber, the sinus venosus, which is formed at the junction of 3 large veins, the right and left anterior venae
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This note was uploaded on 06/13/2011 for the course BIO 119 taught by Professor Stevendroho during the Spring '11 term at Moraine Valley Community College.

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File-016 - BIO 119 File-016 McCague Experiment IV A. Effect...

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