(reference text book pg. 371) **add figure of a typical EKG trace** The ECG records 5 different waves that correspond with myocardial activity. The first wave is the P wave which occurs in response to atrial depolarization. Next the QRS complex occurs as a result of ventricular depolarization and may or may not include Q and S portions of the wave. Finally‚ the T wave is in response to ventricular repolarization. Atrial repolarization is not typically seen on the ECG because it happens around the
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The study of the liver is to gross anatomy as the study of the liver cell is to ______. cytology which of the following terms refers to the foot? Pedal The wrist is _______ to the elbow distal The head is ______ to the feet superior The thoracic cavity includes the ______. heart and lungs Lungs are to the respiratory system as the liver is to the ________ system. digestive The maintenance of a constant internal environment in an organism is termed ________. homeostasis
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after each repolarization and depolarize (the prepotential: spontaneous depolarization). An impulse is sent (a property called automaticity or autorhythmicity) as a stimulus‚ causing the SA nodal cells to reach their threshold of -65 mV. 80-100 such action potentials are generated in the SA per minute (40-60 in the AV‚ but the SA reaches potential first - is faster- and thus sets the pace). This begins the rapid depolarization. The fast‚ voltage-gated Na+ channels open quickly and there is a massive
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assigned the letters P-T. P is a wave representing atrial depolarization‚ which causes the atria to contract‚ in response to electrical impulses sent from the SA node. The PR interval shows the time from the start of atrial depolarization to the start of the ventricular depolarization which follows it‚ which comes after a slight delay in receiving the impulses through the AV node. The QRS complex represents ventricular depolarization‚ and is always followed by a T wave which indicates the
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Please read about the new changes close Cardiac action potential From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (May 2013) As in other cells‚ the cardiac action potential is a short-lasting event in which the difference of potential between the interior and the exterior
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Eliciting (Generating) a Nerve Impulse 1. Why don’t the terms depolarization and action potential mean the same thing? Depolarization has to do with surfaces becoming more negative or positive and reaches a certain point called a threshold. When the threshold is reached‚ an action potential is initiated. 2. What was the threshold voltage in Activity 1? The threshold voltage in Activity 1 was 3.0. 3. What was the effect of increasing the voltage? How does this change correlate to changes
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Final Exam Part 2 1. Antiarrhythmic drugs primarily affect the activity of the following ion channels except A. Cl B. Na C. K D. Ca 2. What is a life-threatening arrhythmia caused by electrical conduction disturbances? A. Atrial fibrillation B. Ventricular fibrillation C. Ectopic foci D. Premature ventricular contraction 3. A common adverse effect from quinidine overdosage is A. Hypertension B. Tachypnea C. Cinchonism D. Dry mouth 4. Disopyramide produces a _____ in conduction
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EKG Rhythm Interpretation How to Analyze a Rhythm All MIHS hospital nursing staff must complete an EKG test with a score of at least 80% upon hire. All hospital RNs are tested annually. This includes recognizing the rhythms‚ measuring the intervals‚ and knowing the appropriate treatment/algorithm according to American Heart Association. This is basic ACLS/PALS information‚ nothing new. In addition to this study packet‚ there are multiple websites that can be accessed on the
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1 The basic functioning units of the nervous system are nerve cells‚ or neurons. Neurons are specialized cells of the nervous system that transmit signals throughout the body. The most important structures of a neuron are the long extensions that extend out from the cell body which are Dendrites and Axons. Dendrites are extensions of neurons that receive signals and conduct them toward the cell body whereas Axons are extensions of neurons that conduct signals away from the cell body to other cells
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responses in the taste nerves; nerves remain responsive to touch‚ temperature‚ and menthol □Knockouts have greatly reduced responses to sweetners‚ glutatmate‚ and bitter substances □Salty: Na+ ions in salty food enter Na+ channels and cause depolarization
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