SA node has Prepotential or pacemaker potential which is the gradual potential rise from the resting membrane potential to threshold  ( -40 mV) & this occur spontaneously.

TLS Online TPP Program

#Id: 1267

#Unit 7. System Physiology – Animal

Zona glomerulosa lacks 17α-hydroxylase. 

TLS Online TPP Program

#Id: 1268

#Unit 7. System Physiology – Animal

The synthesis and secretion of steroid hormones by the adrenal cortex depend on the stimulation of cholesterol desmolase by ACTH.

TLS Online TPP Program

#Id: 1269

#Unit 7. System Physiology – Animal

The zona fasciculata/reticularis, is under the exclusive control of the hypothalamic-pituitary axis.

TLS Online TPP Program

#Id: 1270

#Unit 7. System Physiology – Animal

Negative feedback is exerted by cortisol in the hypothalamic-pituitary axis.

TLS Online TPP Program

#Id: 1271

#Unit 7. System Physiology – Animal

The zona glomerulosa is controlled via; Renin-angiotensin-aldosterone system. 

TLS Online TPP Program

#Id: 1272

#Unit 7. System Physiology – Animal

Aldosterone has three actions on the late distal tubule and collecting ducts of the kidney: 

Increases Na+ reabsorption

Increases K+ secretion

Increases H+ secretion