I. Stimulation of anterior pituitary
II. Stimulation of ovaries
III. Stimulation of neurosecretory cells
IV. Release of Gonadotropic hormone
V. Release of Gonadotropic releasing hormone
Codes :
Understanding Hormonal Regulation Sequence
This solution details the correct physiological order of events in the reproductive hormonal cascade, specifically the Hypothalamic-Pituitary-Ovarian (HPO) axis.
Event Pathway Analysis
The sequence is determined by the flow of signals from the central nervous system to the reproductive organs:
- III. Stimulation of neurosecretory cells: This is the initial trigger, occurring in the hypothalamus.
- V. Release of Gonadotropic releasing hormone (GnRH): Neurosecretory cells release GnRH, which acts on the pituitary gland.
- I. Stimulation of anterior pituitary: GnRH stimulates the anterior pituitary gland.
- IV. Release of Gonadotropic hormone: The anterior pituitary releases gonadotropins (e.g., LH, FSH) in response to GnRH.
- II. Stimulation of ovaries: Gonadotropins travel to the ovaries and stimulate them to produce hormones and mature eggs.
Sequential Order
Arranging these events from the initial trigger (top) to the final response (bottom) yields the following order:
III → V → I → IV → II
This corresponds to the sequence: Stimulation of neurosecretory cells, Release of GnRH, Stimulation of anterior pituitary, Release of Gonadotropic hormone, Stimulation of ovaries.
Important Questions from System Physiology Animal
Which one of the following synaptic vesicles (as observed under transmission electron microscope) contains catecholamines?
Blood hemostasis is the interplay of several intrinsic and extrinsic factors. Deficiency of some of the blood clotting factors and their clinical manifestations are listed below.
Factors
Manifestations
A.
V
i.
Hageman trait
B.
VII
ii.
Hypoconvertemia
C.
IX
iii.
Hemophilia B
D.
XII
iv.
Parahemophilia
Which one of the following options represents all correct matches?
Columns X and Y list the terms associated with gametogenesis and fertilisation.
Column X
Column Y
A
Primordial germ cells
i
Luteinizing hormone
B
Dictyate resting stage
ii
Posterior epiblast
C
Sodium channels
iii.
Male pronuclei
D
Protamines
iv
Block polyspermy
Which one of the following options represents all correct matches?
Nephrons are structural and functional units of the kidneys. Certain statements are made below about structure and function of a nephron.
A. P cells of the collecting duct are involved in Na+ reabsorption and vasopressin-stimulated water reabsorption.
B. P cells of the collecting duct are concerned with acid secretion and HCO3- transport.
C. I cells of the collecting duct are concerned with acid secretion and HCO3- transport.
D. The total length of the nephrons including collecting ducts ranges from 45 to 65 mm.
Which one of the following options has all correct statements?
The non-ciliated cuboidal epithelial cells in bronchioles that secrete important defense markers are called
