Assertion (A) : Damage to anterior third ventricle area results into adipsia.
Reason (R) : Stimulation of anterior third ventricle (AV3V) inhibits drinking.
Codes :
Assertion-Reason Analysis: Anterior Third Ventricle and Adipsia
Assertion (A) Analysis
- Statement: Damage to the anterior third ventricle area results in adipsia.
- Explanation: The anterior third ventricle (AV3V) region is a crucial center involved in the regulation of thirst and water intake. Lesions or damage within this specific brain area disrupt the normal physiological mechanisms that trigger drinking behavior. Consequently, this damage leads to adipsia, which is the loss of the sensation of thirst or the inability to drink water.
- Conclusion: Assertion (A) is true.
Reason (R) Analysis
- Statement: Stimulation of the anterior third ventricle (AV3V) inhibits drinking.
- Explanation: Contrary to the statement, the AV3V region plays a role in initiating and facilitating drinking behavior when the body is dehydrated or detects an osmotic imbalance. Stimulation of this area, particularly when associated with thirst signals, typically promotes water intake, not inhibits it. Inhibitory mechanisms for drinking are located elsewhere or are triggered by different stimuli.
- Conclusion: Reason (R) is false.
Final Conclusion
- Since Assertion (A) is true and Reason (R) is false, the correct option is the one that states "(A) is true, but (R) is false."
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?
Aldosterone is synthesized exclusively in zona glomerulosa due to the presence of _________ enzyme in addition to a dehydrogenase.
How much hemoglobin is present approximately in each normal human red blood cell?
The sensory nerve fibers (Column X) and the sensory receptors connected to different sensory nerves (Column Y) are given below.
Column X
Column Y
Sensory nerve fibre
Sensory receptor
A.
la
i.
Muscle spindle, flower spray ending
B.
Ib
ii.
Pain and cold receptor
C.
II
iii.
Muscle spindle, annulo-spiral ending
D.
III
iv.
Golgi tendon organ
Which of the following options represents the correct match between column X and column Y?
