Absorption of light causes rapid photoisomerization of the bound cis-retinal to the all-trans isomer, triggering a conformational change in opsin that activate the Gαt.

TLS Online TPP Program

#Id: 5315

#Unit 7. System Physiology – Animal

Rapid Ventricular Ejection

atrial filling begins 

left atrial pressure slowly increases as blood is returned to the left heart from the pulmonary circulation.

TLS Online TPP Program

#Id: 5316

#Unit 7. System Physiology – Animal

Rapid Ventricular Ejection

end of this phase coincides with the end of the ST segment (or the beginning of the T wave) on the ECG and with the end of ventricular contraction.

TLS Online TPP Program

#Id: 5317

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 5318

#Unit 7. System Physiology – Animal

Reduced Ventricular

Ejection Ventricular pressure falls because the ventricles are no longer contracting.

TLS Online TPP Program

#Id: 5319

#Unit 7. System Physiology – Animal

Reduced Ventricular Ejection

Because the aortic valve is still open, blood continues to be ejected from the left ventricle into the aorta, albeit at a reduced rate.

TLS Online TPP Program

#Id: 5320

#Unit 7. System Physiology – Animal

Reduced Ventricular Ejection

Left atrial pressure continues to increase as blood returns to the left heart from the lungs.