Sandeep has brittle bones. He may be having deficiency of . . . . . . hormone secreted by kidney.

Which of the following organs can produce hormones?

The wall of the atria of the heart secretes which of the following hormones?

Identify the wrong statements:
$A.$ Erythropoietin is produced by juxtaglomerular cells of the kidney.
$B.$ Leydig cells produce Androgens.
$C.$ Atrial Natriuretic factor,a peptide hormone,is secreted by the seminiferous tubules of the testes.
$D.$ Cholecystokinin is produced by the gastro-intestinal tract.
$E.$ Gastrin acts on the gastric glands and stimulates the secretion of hydrochloric acid and pepsinogen.
Choose the most appropriate answer from the options given below:

$A$ large increase in blood volume and pressure stimulates the atrial wall to produce:

Which of the following pairs shows an antagonistic effect?