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Structure Of The Heart-Wack

Ace Foster avatar Ace Foster
24 July 2022
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Structure from which chordae tendinae originate
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i. papilliary muscle
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Prevents blood movement from right ventricle to right atrium
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m. tricuspid
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Membranes around heart
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k. pericardial sac
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Prevents blood movement from left ventricle to left atrium
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c. mitral (bicuspid) valve
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Gives rise to left and right pulmonary arteries
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L. pulmonary trunk
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Drains blood from myocardium into right atrium
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f. coronary sinus
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inner lining of heart chamber
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g. endocardium
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Layer largely composed of cardiac muscle tissue
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h. myocardium
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space containing serous fluid to reduce friction during heartbeats
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j. pericardial cavity
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drains blood from myocardial capillaries
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d. cardiac vein
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supplies blood to heart muscle
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e. coronary artery
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distributes blood to body organs (systemic circuit) except lungs
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a. aorta
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The period during which a heart chamber is contracting is called
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systole
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The period during which a heart chamber is relaxing is
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diastole
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During ventricular contraction, the AV valves (tricuspid and mitral valves) are
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closed
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During ventricular relaxation the AV valves
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are open
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The pulmonary and aortic valves open when the pressure in the what exceeds the pressure in the pulmonary trunk and aorta?
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ventricles
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Heart sounds are due to what in heart tissues created by changes in blood flow?
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vibrations
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The first sounds of a cardiac cycle occurs when the
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AV valves are closing
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The second sound of a cardiac cycle occurs when the
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pulmonary and aortic valves are closing
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Compare the structure of the tricuspid valve with that of the pulmonary valve.
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The tricuspid valve is between the right atrium and ventricle. The pulmonary valve is where the blood flows out of the right ventricle, into the pulmonary circuit.
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Normally, the what serves as the PACEMAKER of the heart
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SA node
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The what is located in the inferior portion of the inter arterial septum?
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AV node
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The large fibers on the distal side of the AV node make up the
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AV bundle
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The fibers that carry cardiac impulses from the interventricular septum into the myocardium are called
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Purkujie fibers
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An ECG is a recording of electrical changes occurring in the myocardium during the
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cardiac cycle
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Between cardiac cycles, cardiac muscle fibers remain how? with no detectable electrical changes
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polarized
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The P wave corresponds to depolarization of the muscle fibers in teh
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atria
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The QRS complex corresponds to depolarization of the muscle fibers of the
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ventricles
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The T wave corresponds to re polarization of the muscle fibers of the
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ventricles
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Describe the function of chordae tendinae and papillary muslces
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papillary muscle - contract when the rght ventricle contracts, as the tricuspid valve closes the muscles pull on the chordinae tendinae and prevent the cusps from swinging backwards into the right atrium. as the papillary muscles contract and relax chrodae tendinae transmit the resulting increase and decrease in tension respective to the valves
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What is the significance of the difference in thickness between the wall of the aorta and the wall of the pulmonary trunk
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aorta is thicker because it has greater out flow of pressure to deal from the left ventricle blood leaving the heart into the aorta has greater pressure because the blood has to be carried all over the body whereas the pulmonary trunk only pumps blood to lungs
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list in order all the parts of the Blood Flow through the heart
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vena cava, right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary trunk, pulmonary arteries, lungs, pulmonary vein, left atrium, mitral valve, left ventricle, aortic valve, aorta
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What is the significance of the difference in the thickness of the ventricular walls?
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The right ventricle is smaller/thinner as it only has to pump blood through the lungs and back to the right side of the heart. The left side is much thicker/stronger/larger as it has to get the blood to go throughout the whole body.