a juxtaglomerular cell a groups of modified SM cell of afferent arterioles structure -larger, cuboidal in shaped, with round N contain secretory granules function i secrete renin→ adrenal gland→→ aldosterone→ blood pressure↑ angiotensinogen→> angiotensin I-→> angiotensin I‖ ->contraction of SM of bv ii. secrete erythropoietin to promote erythropoiesisa. juxtaglomerular cell: ---a groups of modified SM cell of afferent arterioles ---structure: -larger, cuboidal in shaped, with round N -contain secretory granules ---function: i.secrete renin→adrenal gland→aldosterone→blood pressure↑ ↑ angiotensinogen→angiotensin I→angiotensin II→contraction of SM of BV ii. secrete erythropoietin to promote erythropoiesis