this space. If the amount of fluid continues to increased and cardiac chamber filling is impeded‚ cardiac tamponade results * VAGUS – major PNS innervation of the heart * CALCIUM – is the main cation affecting electrical stimulation of the heart * THRESHHOLD – is the stimulus that changes the resting membrane * COLD – is the condition that slows down blood flow II. Conduction System Cellular Electrophysiology of the Heart * The fast‚ more organized tracts include the
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communicate info through these electrical signals - neurons generate a constant negative voltage across membrane: the rmp - an AP abolishes the –ve rmp‚ making membrane potential transiently positive - we can record and measure ion currents using electrophysiology - hyperpolarization is usually the movement of +ve ions moving outward‚ but it can also be the movement of –ve ions moving inward; while depolarization is the opposite How do these membrane potentials arise? - electrical signals are generated
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heart muscle. When cardiac muscle cells are damaged or destroyed‚ they are no longer able to conduct the electrical impulses that flow through them. This causes the electrical signal to terminate at the damaged tissue or be directed away from the flow of the signal. The termination or redirection of the electrical signal will alter the manner in which the heart contracts. A cardiologist can look at a patient ’s electrocardiogram and determine the presence of damaged cardiac muscle based on the
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ACLS PRE-TEST ANNOTATED ANSWER KEY June‚ 2011 Question 1: Please identify the rhythm by selecting the best single answer Agonal rhythm/asystole Atrial fibrillation Atrial flutter Coarse ventricular fibrillation Fine ventricular fibrillation Monomorphic ventricular tachycardia Normal sinus rhythm Polymorphic ventricular tachycardia X Pulseless electrical activity Reentry supraventricular tachycardia Second-degree AC block (Mobitz I Wenckebach) Second-degree AV block (Mobitz II block) Sinus bradycardia
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Outline the differences between the excitation-contraction coupling mechanism between skeletal and cardiac muscles. Excitation-contraction coupling is the combination of the electrical and mechanical events in the muscle fibres and is related by the release of calcium from the sarcoplasmic reticulum. (Silverthorn‚ 2007) In the skeletal muscle‚ action potential in the nerves is generated when the somatic motor neurons releases the neurotransmitter acetylcholine (ACh)‚ at the neuromuscular junction
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What Broke My Father’s Heart by Katy Butler‚ published June 14‚ 2010 in the New York Times One October afternoon three years ago while I was visiting my parents‚ my mother made a request I dreaded and longed to fulfill. She had just poured me a cup of Earl Grey from her Japanese iron teapot‚ shaped like a little pumpkin; outside‚ two cardinals splashed in the birdbath in the weak Connecticut sunlight. Her white hair was gathered at the nape of her neck‚ and her voice was low. “Please help me get
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1. What do those numbers (130/87) mean? What do they relate to in the cardiac cycle? The numbers 130/87 is the blood pressure of the patient. The top number 130‚ is the reading that is received when the heart is in contraction and blood is pushed out of the heart into the rest of the body (this is called systole). The bottom number 87‚ is the reading when the heart is at it relaxed state and is being refilled with blood (this is called diastole.) 2. This deposition of platelets and fibrin can
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congested. This is then called congestive heart failure. 2. What is third-degree heart block? What would the EKG tracing of someone with third-degree heart block look like? Third-degree block‚ also known as third-degree atrioventricular block is “a cardiac conduction system where there is no conduction through the atrioventricular node” (Budzikowski 2014). The patient will have severe bradycardia with independent atrial and ventricular rates. These patients may suffer from ventricular standstill‚ which
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| |Does Milrinone Prevent Low Cardiac Output Syndrome in the Paediatric Population after Congenital Heart surgery? | |Nursing 730 (A&B) | | | |Paediatric Cardiac Nursing
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REVIEW SHEET EXERCISE 3 Neurophysiology of Nerve Impulses NAME: LAB TIME/DATE: Eliciting (Generating) a Nerve Impulse 1. Why don’t the terms depolarization and action potential mean the same thing? Action potential is a quick depolarization followed by a repolarization. Depolarization is a one way trip. It also takes a substantial depolarization to cause an action potential. 2. What was the threshold voltage in Activity 1? 3.0 V 3. What was the effect of increasing the voltage?
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