Study questions - 11.2 lecture notes PDF

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11.2 lecture notes...

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Study Question 11.2 1. Pacemakers, cardiac center, and the endocrine system. 2. A pacemaker is a common name for sinoatrial node 3. 60 and 100 bpm. the SA node communicate this to the heart by sending out an electrical impulse 4. The autonomic nervous system is the collective branch of the nervous system 5. The sympathetic branch of the nervous system is the part of the nervous system that tells the heart to beat faster. The heart is guided by a parasympathetic section of the nervous system to slow down the number of beats per minute. 6. The baroreceptors constantly monitor blood force and send sensory information back to the cardiac center, exciting either the parasympathetic or sympathetic branches. 7. Epinephrine, norepinephrine, and thyroxine released by the endocrine system affect the heart rate. 8. It transmits signals that control both heart rate and contraction strength of the muscle tissues 9. The AV node generates the electrical impulse to get "tied up", or delayed for about a tenth of a second. 10. The electrical impulse travels down the left bundle branches and the right to millions of Purkinje fibers in both ventricles, which spur the ventricles to contract. 11. It stands for Electrocardiogram. It records the electrical activity of the heart. 12. Arrhythmias in the atria or AV node are not a problem, but those in the ventricle are more dangerous and can be life-threatening. 13. It causes damage to the heart muscle, hypertension, smoking, excessive alcohol consumption, dietary supplements, stress. 14. Types of arrhythmia are: Tachycardia ventricular tachycardia premature atrial contractions 15. The Third-degree heart block is life-threatening because it is a complete blockage that doesn't allow electrical impulses to pass. 16. It is because Their parasympathetic and sympathetic systems do not regulate. 17. It's a system that uses electrical current to interrupt the heart and allow the SA node to re-start beating....