When the potential reaches a threshold voltage of about −40 millivolts, the L-type calcium channels become “activated,” causing the action potential.

TLS Online TPP Program

#Id: 5811

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 5812

#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: 5813

#Unit 7. System Physiology – Animal

Zona glomerulosa lacks 17α-hydroxylase

Increases Na+ reabsorption Increases K+ secretion Increases H+ secretion

TLS Online TPP Program

#Id: 5814

#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: 5815

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5816

#Unit 7. System Physiology – Animal

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