Ap6
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The document contains a quiz about the heart's electrical conduction system and ions involved. It asks the student to: 1) Name the 3 layers of the heart and its natural pacemaker. 2) Place the electrical signal conduction steps in order from the SA node to ventricular contraction. 3) Name 3 ions found in the human body. It then provides information about the cardiac pacemaker (SA node), action potentials, thresholds, and depolarization. It explains what depolarizes the SA node involves potassium, calcium, and sodium ion flows.
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Ap6
- 1. AP 6
- 2. Quiz 1. Name the 3 layers of the heart 2. What is the name of the heart’s natural pacemaker? 3. Place the following in the correct order, from beginning of electrical signal to ventricular contraction: A) bundle of His b) AV node c) SA node d) Purkinje fibers 4.Name 3 ions found in the human body
- 4. Cardiac pacemaker SA node: heart’s pacemaker Action potential = nerve impulse (signal)
- 5. Threshold: voltage inside nerve cells, above which an impulse will be triggered Depolarization: the inside of the nerve cell is becoming less negatively charged
- 7. What depolarizes the SA node? 1. decreased outward flow of K+ 2.increased influx (inward flow) of Ca 2+ 3. A constant, slow influx of Na+
- 8. HW 1. Read p. 291 – 294 2. Review 283-288 (ignore box on fetal circulation)