The valve located between the right ventricle and the pulmonary trunk is the A.
ID: 85349 • Letter: T
Question
The valve located between the right ventricle and the pulmonary trunk is the A. aortic semilunar valve. B. pulmonary semilunar valve. C. tricuspid valve. D. mitral valve. E. bicuspid valve. The skeleton of the heart: A. helps to support the coronary arteries. B. anchors cardiac muscle fibers. C. contains osseous tissue. D. prevents the backflow of blood in the heart. E. stimulates the myocardium. Action potentials pass from one myocardial cell to another through areas of low electrical resistance called A. gap junctions. B. fibrous heart rings. C. electromagnetic discs. D. sarcolemma sclerotic plaques. E tight junctions. Which of the following sequences is correct? A AV node, AV bundle, SA node, Purkinje fibers, bundle branches B. Purkinje fibers, bundle branches, AV node, AV bundle, SA node C. SA mode, AV node, AV bundle, bundle branches, Purkinje fibers D. SA bundle, AV node, bundle branches, Purkinje fibers E. AV node, SA mode, bundle branches, AV bundle, Purkinje fibers In a normal electrocardiogram, the A. P wave results from repolarization of the atria. B. QRS complex results from ventricular depolarization. C. P wave occurs after the QRS complex but before the T wave. D.T wave represents depolarization of the atria. E. repolarization of the atria is clearly visible. Lymph capillaries are found in the A. epidermis. B. muscles. C. bone marrow. D. central nervous system. E. dermis.Explanation / Answer
48. Option B is correct. The heart has 4 valves. 1. Mitral valve (bicuspid valve): Between right and left auricle. 2. Tricuspid valve (between left and right auricle). 3. Aortic semilunar valve: between left ventricle and aorta 4. Pulmonery semilunar valve: Between right ventricle and pulmonery trunk.
49. Option B is correct. The fibrous skeleton of the heart is located between the atria and ventricles and is formed from dense irregular connective tissue. It provides a rigid framework for the attachment of cardiac muscle tissue.
50. Option A is correct. Action potential propagation in heart muscle (myocardial cell) is different from normal action potential (other than heart muscle). Here action potential propagation occurs through a gap junction present between two myocardial cell while in other condition generate through neuronal part (axon and dendron).
51. Option C is correct. The electrical signal generates from SA node which moves to the AV node then AV bundle, bundle branch and finally to the purkinje fibers which cause heart contraction and relaxation.
52. Option B is correct. 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. The first deflection is the P wave associated with right and left atrial depolarization. The QRS complex results from ventricular depolarization. The T wave represents ventricular repolarization.
53. Option E is correct. Skin is composed of two layers. Upper is epidermis and inner is dermis. Epidermis contains dense epithellium celss while dermis contai loose connective tisuue. Lymphatic capillaries found between blood vessels and tissues in the dermis.
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