Auxin and cytokinin are both required for the initiation of xylogenesis

TLS Online TPP Program

#Id: 5296

#Unit 7. System Physiology – Animal

Mean arterial pressure is not the simple mathematical average of diastolic and systolic pressures.

This is because a greater fraction of each cardiac cycle is spent in diastole than in systole.

TLS Online TPP Program

#Id: 5297

#Unit 7. System Physiology – Animal

Cardiac cycle  The cardiac events that occur from the beginning of one heartbeat to the beginning of the next.

TLS Online TPP Program

#Id: 5298

#Unit 7. System Physiology – Animal

Each cardiac cycle is initiated by spontaneous generation of an action potential in the sinus node.

TLS Online TPP Program

#Id: 5299

#Unit 7. System Physiology – Animal

Period of relaxation called diastole, during which the heart fills with blood A period of contraction called systole

TLS Online TPP Program

#Id: 5300

#Unit 7. System Physiology – Animal

The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate.

TLS Online TPP Program

#Id: 5301

#Unit 7. System Physiology – Animal

Atrial systole 

Preceded by the depolarization of the atria

Contraction of the atrium causes an increase in atrial pressure.