25. The suprachiasmatic nucleus, located in the hypothalamus, has been shown to

Question

25. The suprachiasmatic nucleus, located in the hypothalamus, has been shown to be in homosexual men than in heterosexual men. A) half as big B) two times larger C) four times larger D) one thirds smaller 26. Both heterosexual men and homosexual women exhibit A) B) C) D) no differences in volumes between right and left cerebral hemispheres right cerebral hemisphere volumes larger than the left right cerebellar hemisphere volumes larger than the left left cerebral hemisphere volumes larger than the right 27. Successful performance in the "place" version of the Morris water maze task is critically dependent on the A) amygdala B) hippocampus C) interpositus nucleus D) insula 28. is a brain change associated with postraumatic stress disorder (PTSD). A) B) C) D) Reduced hippocampal volume Reduced anterior cingulate cortex activity Reduced amygdala activity Reduced insular cortex activity 29·The long-lasting sensitization of the gill reflex in Aplysia through associative learning depends on a A) reduction in potassium (K') flow in the sensory neuron B) reduction in cAMP-dependent protein kinase A (PKA) in the sensory neuron C) decrease in levels of serotonin D) reduction in cyclic adenosine monophosphate (CAMP) 30. High stimulation parameters (high-frequency stimulation) are required for long-term potentiation (LTP) because it creates a situation where A) high-frequency stimulation inhibits hippocampal mossy fibers B) high-frequency stimulation reduces 0 brain waves C) serotonin levels increase dramatically with this type of stimulation D) magnesium no longer blocks the NMDA receptor after postsynaptic depolarization

Explanation / Answer

1.Option B)

Analysis of hypothalamus in homosexual men found that the volume of the suprachiasmatic nucleus (SCN) in homosexual men is 1.7 times as large as that of heterosexual males.

2.Option B)

heterosexual men and homosexual women have been found to have many similarities in brain structure.They are found to have  slightly larger right cerebral hemisphere than the left .In homosexual men and heterosexual women the hemispheres were symmetrical.

3.Option B)

Place learning can get impaired when there is damage to the hippocampal areas in brain.

4.Option B)

Those suffering from Post Traumatic Stress Disorder, have reduced brain activity in  brain activity in the dorsal and rostral anterior cingulate cortices and the ventromedial prefrontal cortex.It also effects amygdala and hippocampus while encoding memories of the traumatic event.

5.Option B)

long-term sensitization through associative training results in a decrease in the amount of cAMP-dependent protein kinase in animals 24 hours after training.

6.Option D)

In long term potentiation, magnesiumions withdraw from the NMDA receptors and allows large numbers of calcium ions to enter the cell.

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