+
Related Flashcards
Cards In This Set
| Front | Back |
|
The Hypothalamus connects ___?
|
 |
|
The hypothalamus controls
|
 |
|
The hypothalamus recieves inputs from
|
 |
|
The hypothalamus sends outputs to
|
 |
|
How are hypothalamic hormones secreted by the anterior pituitary?
|
 Secreted by neuronss of portal hypophysial vessel, which hen secretes hormones into the blood |
|
Cells of the posterior pituitary originate in the ___?
|
Hypothalamus. neurons deliver hormones then released from posterior pituitary into the blood.
|
|
Name the hypothalamic hormones
|
Thyrotropin releasing hormone (TRH)-Gonadotropin releasing hormone (GnRH)SomatostatinGHRH
Prolactin inhibiting hormone/ DopamineCorticotropin releasing hormone (CRH) |
|
What is the function of GnRH
|
-regulation of pituitary gonadotropins LH and FSH
note: GnRH is also called LHRH |
|
Describe the hypothalamic-pituitary-gonadal axis
|
 Hypothalamus integrates many signals, desides to stimulate or inhibit endocrine glands -note that many hormones downregulate themselves via negative feedback |
|
GnRH release must be pulsatile, or else... ___?
|
LH and FSH become desensitized (dose and timine of hormone is critical)
|
|
What are circadian Rhythms?
|
 |
|
Light acts on body via what two pathways?
|
-primary optic tract = governs visual perception and responses
Retinothalamic tract: governs circadian, endocrine, and neurobehavioural functions. |
|
The retinothalamic tract is most sensitive to ___?
|
Blue light stimulation energy in wavelengths of roughly 459-485 nm
|
|
How are light signals in retinothalamic track affectiing proteins in the retinal ganglion?
|
 Light signals through melanopsin protein that undergoes a chemical change when exposed to the light recieved by intrinsically photosensitive retinal ganglion cells in the back of the eye |
|
What drives our biological clocks?
|
Circadian rhythms, which are controlled by a master clock (consisting of a group of nerve cells in the brain called the SCN)
|
