Rods 

Have low acuity or resolution

are sensitive to low-intensity light

receptors for night vision (scotopic vision)

TLS Online TPP Program

#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.

TLS Online TPP Program

#Id: 5312

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5313

#Unit 7. System Physiology – Animal

Rapid Ventricular Ejection When ventricular pressure becomes greater than aortic pressure, the aortic valve opens (left heart).

TLS Online TPP Program

#Id: 5314

#Unit 7. System Physiology – Animal

Rapid Ventricular Ejection

Blood is rapidly ejected from the left ventricle into the aorta through aortic valve, driven by the pressure gradient between the left ventricle and the aorta.

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.