Polyleucine and polyalanine readily form a-helical structures.

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#Id: 5307

#Unit 7. System Physiology – Animal

Isovolumetric Ventricular Contraction

Initiates contraction of the ventricles

Intraventricular pressure rises sharply as the myocardium presses on the blood in the ventricle

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#Id: 5308

#Unit 7. System Physiology – Animal

Isovolumetric Ventricular Contraction As soon as ventricular pressure exceeds atrial pressure, the AV valve closes. 

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#Id: 5309

#Unit 7. System Physiology – Animal

Closure of the AV valves produces the first heart sound (S1).

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#Id: 5310

#Unit 7. System Physiology – Animal

During isovolumetric Ventricular contraction, the volume of the ventricle does not change because all valves are closed.

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#Id: 5311

#Unit 7. System Physiology – Animal

Period of isovolumetric ventricular contraction lasts, until the pressures in the left and right ventricles,exceed the pressures in the aorta & pulmonary artery.

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#Id: 5312

#Unit 7. System Physiology – Animal

During Isovolumetric Ventricular Contraction QRS waves appear as a result of electrical depolarization of the ventricles