Renin is made by
granular cells of the juxtaglomerular apparatus
the kidneys
the nephrons
all of the above.

granular cells of the juxtaglomerular apparatus

Explanation:

Renin or angiotensinogenase is a circulating enzyme released by granular cells of the juxtaglomerular apparatus of the kidney in response to a series of physiological stimuli and causes activation of the renin-angiotensin-aldosterone system.

Renin transforms angiotensinogen from the liver into angiotensin I, which is transformed into angiotensin II by the lungs.

i believe the correct answer is d

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.