the serous pericardium 1. Often infiltrated with fat‚ especially older people. 2. Myocardium (“muscle heart”) 2. Spiral bundles of cardiac muscle cells that form the bulk of the heart 3. Layer that contracts 4. Fibrous skeleton of the heart: crisscrossing‚ interlacing layer of connective tissue 1. Anchors cardiac muscle fibers 2. Supports great vessels and valves 1. Without support they might eventually become stretched because of the
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CARDIOVASCULAR Dsyrhythmias * Etiology * Disturbances in automaticity – initiation of impulse is altered * Disturbances in conduction – alteration in the speed the impulse travels * Reentry of impulses – cardiac tissue is depolarized multiple times by the same impulse * Speed‚ distance and location can be changed or affected (blockages cause change in heart rhythm) * Risk factors * Cardiovascular disease‚ MI * MI – death of tissue – no electricity
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70-year-old patient finds his doctor responsible in coercing him into having a pacemaker inserted in his body. The doctor threatens to have the patient’s truck driver license revoked if he refuses treatment. Although the patient does not want the pacemaker put in his body‚ he does not want to lose his truck driver job which is how he supports himself. Ultimately‚ the patient submits to his doctor’s threats and has the pacemaker inserted into his body. The case is examined finding legal and moral faults
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terms: • autorhymicity- The heart is autorhythmic. This means it generates its own rhythmic action potential independent of the nervous system. • sinoatrial node- is the impulse-generating (pacemaker) tissue located in the right atrium of the heart‚ and thus the generator of normal sinus rhythm. • pacemaker cells- are specialized cells that cause involuntary muscles and tissues to contract or dilate. • vagus nerves- carry a wide assortment of signals to and from the brain‚ and they are responsible
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Physiology Chooljian Lecture Exam #3 Review FIRST: Be sure to: Study chapter objectives‚ summaries‚ and reviews Review your lecture notes ANS Define: denervation hypersensitivity‚ ganglia‚ mass activation‚ sympathoadrenal system‚ dual innervation. What are the two divisions of the ANS? Where are the neurons for each division located‚ and what is the major function of each division? What type of neurons (sensory or motor) are in the ANS? What are the names for the two
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Background: Mr. A is a 65-year-old male admitted on 3/7 for pacemaker revision and video-assisted thoracic surgery (VATS) epicardial lead placement. He is currently post op day 6. Mr. A has a history of viral cardiomyopathy which was diagnosed 3/2016. His ejection fraction is estimated to be 30%. Following the removal of a cardiac resynchronization therapy (CRT) device in 11/2017‚ Mr. A was required to wear a LifeVest. In the past‚ Mr. A has undergone three implantable cardioverter defibrillator
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10.1 OVERVIEW OF MUSCULAR TISSUE Types of muscular tissue There are 3 types of muscular tissue: skeletal‚ cardiac‚ & smooth. All 3 may share some things but they differ from one another in their microscopic anatomy‚ location‚ & how they are controlled by the nervous and endocrine systems Skeletal muscle tissue function of most is to move bones of the skeleton (are few that attach to other structures ex--the skin). Muscle tissue is striated b/c alternating light and dark protein bands (striations)
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“Together with dogs being similar in size to humans‚ is what made it possible for VA researchers to develop the implantable cardiac pacemaker‚ which millions of people today depend on. “ Scientist have developed the pacemaker because they tested it on animals. Scientist has also tested a lot of surgeries on animals. A lot of people depend on things like the pacemaker and most of the surgeries to survive. Doctors couldn’t make and do these things without testing it on animals first. Animal testing
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Physiology of the Circulatory System Activity 1) When a person goes from a prone position to standing up‚ all of the blood rushes from to the feet due to gravity. This causes reduced blood flow back to the heart‚ which in turn causes reduced cardiac output. The baroreceptors help to increase blood pressure and heart rate as seen through the baroreceptor reflex test‚ with a resting systolic heart rate of 54bpm to a baroreceptor reflex heart rate of 70bpm‚ an increase of 16bpm. 2) Having high blood
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Pivot joints (known also as rotary joints). These joints allow for rotation around an axis. There is a pivot joint near the top of your spine that allows your head to move from side to side. Hinge joints. This type of joint can open and close like a door. Your elbow is a hinge joint. Your biceps and triceps muscles are basically two people standing on opposite sides of a wall (the humerus‚ or upper-arm bone)‚ each with one hand reaching over to its respective side of a door (the bones of the lower
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