Presentation on theme: "Frog Heart Muscle. Contraction Pathway SA node Atria AV node Ventricles Gap Junctions Slows transmission of AP Increases in Na+ conductance; causes AP;"— Presentation transcript:
Frog Heart Muscle
Contraction Pathway SA node Atria AV node Ventricles Gap Junctions Slows transmission of AP Increases in Na+ conductance; causes AP; autorrhythmic Bundle of His Purkinje fibers
Heart rate Frequency of AP created by the SA node – Fires 100x/min on own – Adult heart rate is about 70 bpm. WHY?
Amphibian Heart 2 atria 1 ventricle O2 and deO2 blood separated by conus arteriosis and timing of atrial contractions. Pressure differences is systemic and pulmonary circuits can allow O2 and deO2 blood to mix via an intercardiac shunt. Helps stabilize O2 content in blood, thermoregulate, and allow the skin to be used as a respiratory organ. Sinus venosus = SA node in mammals.
Homework Write a Results, and Discussion for this lab. Answer ALL questions within the text.
Course Reviews Please do them ASAP. Print the confirmation at the end. 5 extra credit points for completing this!! Please provide constructive criticism if you have any. I’m always trying to improve my teaching!