Evaluate the hypothesis that the suprachiasmatic nucleus (SCN) ...

[jayhills49]

Evaluate the hypothesis that the suprachiasmatic nucleus (SCN) acts as the primary biological clock.
 
  What will be an ideal response?

Question 2

After his penis was destroyed at age 7 months in a botched circumcision procedure, Bruce (the subject of the chapter prologue)
 
  A) then became Brenda.
  B) retained his a male identity.
  C) received regular injections of testosterone from age 15 to 30 .
  D) was given a penile implant at age 5.
  E) received estrogen pills starting at age 5.

[patma1981]

Answer to Question 1

Answer: The SCN receives afferent signals from the retina (melanopsin in ganglion cells) that provide the capacity of light signals to reset the clock (zeitgeber function). Damage to the SCN impairs circadian rhythms. Cells within the SCN show reliable changes in neural activity across the day and the night. Transplanted SCN cells placed into the ventricles are sufficient to restore circadian rhythms in hamsters whose own SCN was ablated.

Answer to Question 2

Answer: A

[jayhills49]

Gracias!

[olderstudent]

Thanks for the timely response, appreciate it