Large quantities of positive potassium ions diffuse out of the SA node.

TLS Online TPP Program

#Id: 1265

#Unit 7. System Physiology – Animal

The conversion of cholesterol to pregnenolone, catalyzed by cholesterol desmolase, in mitochondria.

TLS Online TPP Program

#Id: 1266

#Unit 7. System Physiology – Animal

Zona glomerulosa cells capable of secreting significant amounts of aldosterone because they contain the enzyme aldosterone synthase.

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.