The Tell Tale Heart ( ANNOTATED )

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The cardiac cycle is a series of physiological, mechanical and electrical events comprising one heartbeat. What are the different stages of the cardiac cycle?

Stroke volume is the amount of blood pumped into the aorta during each ventricular systole, usually measured in milliliters. Heart rate is the number of heartbeats per minute. The average heart can push around 5 to 5.5 liters per minute at rest. Heart Health ProblemsArad Y, Spadaro L, Goodman K, Newstein D, Guerci A. Prediction of Coronary Events with Electron Beam Computed Tomography. J Am Coll Cardiol. 2000;36(4):1253-60. doi:10.1016/s0735-1097(00)00872-x - Pubmed I smiled, --for what had I to fear? I bade the gentlemen welcome. The shriek, I said, was my own in a dream. The old man, I mentioned, was absent in the country. I took my visitors all over the house. I bade them search --search well. I led them, at length, to his chamber. I showed them his treasures, secure, undisturbed. In the enthusiasm of my confidence, I brought chairs into the room, and desired them here to rest from their fatigues, while I myself, in the wild audacity of my perfect triumph, placed my own seat upon the very spot beneath which reposed the corpse of the victim. The rhythmic heart beats are actually spontaneous, as they originate from the cardiac tissue itself. It has been proven that the heart continues beating regularly even after it has been disconnected from the body and the cardiac nerves. The AVN has a slower conduction velocity (0.05m/sec) than the atria, allowing maximal ventricular filling prior to contraction. 8

He turned to his work. The noise outside had ceased, and presently in going out I stopped at the door. In the steady buzz of flies the homeward-bound agent was lying finished and insensible; the other, bent over his books, was making correct entries of perfectly correct transactions; and fifty feet below the doorstep I could see the still tree-tops of the grove of death. The right atrium contracts pushing blood through the right atrioventricular valve into the right ventricle. The right ventricle then contracts passing the blood into the pulmonary trunk via the pulmonary valve to reach the lungs To allow for improved image quality and dose reduction, cCTA is usually ECG-triggered to adapt the scan sequence to the patient's heartbeat.

The auricle is the flap that covers the atrium, it looks like an ear. The pulmonary trunk is the located at the front of the heart and enters at an angle. The bundle of His branches into the left and right bundle branches which travel down the interventricular septum. I had then, as you remember, just returned to London after a lot of Indian Ocean, Pacific, China Seas -- a regular dose of the East -- six years or so, and I was loafing about, hindering you fellows in your work and invading your homes, just as though I had got a heavenly mission to civilize you. It was very fine for a time, but after a bit I did get tired of resting. Then I began to look for a ship -- I should think the hardest work on earth. But the ships wouldn't even look at me. And I got tired of that game, too Your heart is a pump that sends blood through your body. For each heartbeat, electrical signals travel through the conduction pathway of your heart. It starts when your sinoatrial (SA) node creates an excitation signal. This electrical signal is like electricity traveling through wires to an appliance in your home.

Style and genre: Heart of Darkness is a frame story: the first narrator is the unnamed passenger on board the Nellie on the Thames listening to the primary narrator, Charles Marlow, who is relating the events that happened to him when he was in the Congo. Marlow also reports the words of other characters and the stories they tell, drawing the reader deeper into the narrative frame structure. See the Labelling the heart activity for additional support in using this interactive. Parts of the hearti Identify the atria and ventricles. Try to describe any differences in the structures of the walls of the atria and ventricles. TRUE! — nervous — very, very dreadfully nervous I had been and am; but why will you say that I am mad? The disease had sharpened my senses — not destroyed — not dulled them. Above all was the sense of hearing acute. I heard all things in the heaven and in the earth. I heard many things in hell. How, then, am I mad? Harken! and observe how healthily — how calmly I can tell you the whole story.

He broke off. Flames glided in the river, small green flames, red flames, white flames, pursuing, overtaking, joining, crossing each other -- then separating slowly or hastily. The traffic of the great city went on in the deepening night upon the sleepless river. We looked on, waiting patiently -- there was nothing else to do till the end of the flood; but it was only after a long silence, when he said, in a hesitating voice, "I suppose you fellows remember I did once turn fresh-water sailor for a bit," that we knew we were fated, before the ebb began to run, to hear about one of Marlow's inconclusive experiences The atrioventricular node delays the SA node’s electrical signal. It delays the signal by a consistent amount of time (a fraction of a second) each time. State that blood is composed of plasma, erythrocytes, leucocytes (phagocytes and lymphocytes) and platelets.The veins carry impure blood from different parts of the body to the heart for oxygenation. However, the pulmonary vein carries oxygenated blood to the heart. The right atrioventricular/tricuspid valve is between the right atrium and right ventricle. It has three cusps/leaflets: anterior/anterosuperior, septal, and posterior/inferior. The pacemaker does this every time the heart needs to “beat”, so if a person has a resting heart rate of 60 beats per minute (bpm), then the SAN will be sending out electrical impulses on average once every second Doctors can use the ECG trace to examine the patient’s electrical activity within the heart and understand better the status of the patient’s health.