centered nucleus. ed discs. B) Cardiac muscle cells C) Cardiac muscle cells the
ID: 164777 • Letter: C
Question
centered nucleus. ed discs. B) Cardiac muscle cells C) Cardiac muscle cells the pulmonary circuit first enters the Skeletal muscle cels 45) Blood returning to A) right atrium. B) right ventricle. C) left atrium. D) left ventricle. E) conus arteriosas. the blood from 46 me right atrium coronary sinus. B)superior vena cava. C) inferior vena cava. D) systemic circuit. 4 cardiac cells damaged byinfarction will show which ofthe following? A) switch to anaerobic mdabolism B) release of enzymes intothe drculation release of troponin TMI intothe circulation D) release of CKMB intothedraulation E) All of the answers are comect. Blood flowing into the herrtfrom the venae cavae flows next through the A) mitral B)bicuspid C) tricuspid D) pulmonary semilunar 49)When the semiluparnhesdose, the Av valves then B) open. D) contract. E) prolapse. so) The pulmonary semilunar valve prevents backward flow into the B) pulmonary trunk. D) right ventricle. valve.Explanation / Answer
Answer:
1). Abnormally slow depolarization of the ventricles would most change the shape of the QRS complex in an ECG tracing.
The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram (EKG or ECG). It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the human heart.
2). D) 4, 3, 2, 5, 1.
3). B) depolarization of the atria.
Depolarization occurs in the four chambers of the heart: both atria first, and then both ventricles. The sinoatrial (SA) node on the wall of the right atrium initiatesdepolarization in the right and left atria, causing contraction, which is symbolized by the P wave on an electrocardiogram.
4). C) Bradycardia; tachycardia
Bradycardia, also known as bradyarrhythmia, is a condition wherein an individual has a slow heart rate.
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate.
5). B). closing of atrioventricular valves.
The mitral valve, also known as the bicuspid valve or left atrioventricular valve, is a dual-flap valve in the heart that lies between the left atrium and the left ventricle. The “ lub” is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.
6). B) parasympathetic stimulation.
7). C). 7500 ml/min
Cardiac Output = Stroke Volume x Heart Rate.
= 75 * 100 = 7500 ml/min
8). E) All of the answers are correct.
9). C). medulla oblongata.
The brain stem controls breathing and heart rate as well as blood pressure and alertness. Found at the top of the spinal column, the brain stem consists of three main parts, including the medulla oblongata, pons and midbrain. The medulla oblongata controls cardiac and respiratory rates.
10). E) both repolarizing and relaxing
Atrial and ventricular depolarization and repolarization are represented on the ECG as a series of waves: the P wave followed by the QRS complex and the T wave.
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