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Which of the following is an accumulation and release centre of neurohormones ?
A
Posterior pituitary lobe
B
Intermediate lobe of the pituitary
C
Hypothalamus
D
Anterior pituitary lobe
Detailed Solution
Neurohormones are hormones produced by neurosecretory cells (modified neurons).
Oxytocin and vasopressin (ADH) are synthesised by the neurosecretory cells of the hypothalamus.
They are transported along the axons of these cells to the posterior lobe of the pituitary (neurohypophysis, pars nervosa).
The posterior pituitary does not synthesise any hormone; it only stores (accumulates) these neurohormones and releases them into the blood when required.
So the hypothalamus is the site of synthesis, while the posterior pituitary is the accumulation and release centre.
The anterior and intermediate lobes synthesise and secrete their own hormones.
So the accumulation and release centre of neurohormones is the posterior pituitary lobe.
Oxytocin and vasopressin (ADH) are synthesised by the neurosecretory cells of the hypothalamus.
They are transported along the axons of these cells to the posterior lobe of the pituitary (neurohypophysis, pars nervosa).
The posterior pituitary does not synthesise any hormone; it only stores (accumulates) these neurohormones and releases them into the blood when required.
So the hypothalamus is the site of synthesis, while the posterior pituitary is the accumulation and release centre.
The anterior and intermediate lobes synthesise and secrete their own hormones.
So the accumulation and release centre of neurohormones is the posterior pituitary lobe.