Changes

===Advantages of Constriction of the Efferent Arteriole===

===Advantages of Constriction of the Efferent Arteriole===

* If you increase the resistance in the kidneys you contribute to increasing total peripheral resistance.  This helps to return blood pressure towards normal.  (Angiotensin 2 also has vasoconstrictive effects in other organs.)

* If you increase the resistance in the kidneys you contribute to increasing total peripheral resistance.  This helps to return blood pressure towards normal.  (Angiotensin II also has vasoconstrictive effects in other organs.)

* The kidneys can tolerate the reduced perfusion allowing blood to be prioritised to organs which need it like the brain and heart.

* The kidneys can tolerate the reduced perfusion allowing blood to be prioritised to organs which need it like the brain and heart.

* The constriction of the efferent arterioles also reduces hydrostatic pressure in the [[The Formation of the Filtrate by the Glomerular Apparatus- Anatomy & Physiology#Pressure in the Peritubular Capillaries|peritubular capillaries]] this increases reabsorption of water and salt thus helping to restore the ECF and thus helps to normalise blood pressure.

* The constriction of the efferent arterioles also reduces hydrostatic pressure in the [[The Formation of the Filtrate by the Glomerular Apparatus- Anatomy & Physiology#Pressure in the Peritubular Capillaries|peritubular capillaries]] this increases reabsorption of water and salt thus helping to restore the ECF and thus helps to normalise blood pressure.