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ANSC 211 Exam 4 Questions And Answers
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ANSC 211 Exam 4 Questions And Answers ANSC 211 Exam 4 Questions And Answers ANSC 211 Exam 4 Questions And Answers
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ANSC 211 Exam 4Since the pituitary is such a vital part of the neuroendocrine system, where is it located in the brain?
Pituitary located as base of hypothalamus
How do the pituitary and hypothalamus communicate with one another in the brain Each receives a vast
amount of blood which allows flow of nutrients and O2 in the body
What is the process of releasing the thyroid hormone to the body? 1. TRH is released via negative
feedback mechanism of T3 + T4
2. TRH signals to pituitary to release TSH and T3 and T4 also can signal the release of TSH
3. TSH signals the thyroid to release T3 + T4 which can act as negative feedback mechanisms
What are the main 5 effects of the thyroid hormone in the bird? 1. Increase metabolism
2. Increase lipolysis
3. Increase catecholaminergic activity
4. Increase bone turnover
5. Promotes oxygen consumption
In terms of both the thyroid hormones produced, which one is going to be more active? T3 is be more
active than T4
What are some of the factors that influence thyroid hormone production? - Food ability
- Iodine levels
- Food composition
- Age (older have less)
- Time of day
, - Season (colder birds use more)
- Temp.
What is the purpose of the Thyroxine-binding Globulin (TBG) in functioning with the thyroid hormone?
Thyroid hormone binds to TBG proteins in order to stabilize hormone levels in blood
How do thyroid hormone levels vary between altricial birds and precocial birds that contributes to
dependency after birth? Altricial (need parental care)
- T3 + T4 levels remain low throughout peri-hatch period
- Levels gradually rise during 2-3 weeks post-hatch
Precocial (fully functioning at birth)
- T4 rises during late embryonic life
- T4 + T3 rise during peri-hatch period
What causes T3 to be more active than T4 in terms of thyroid hormone receptors in the body? T3 will
bind better to receptors which makes it more active + effective than T4
How does GH act in the body with other hormones to promote growth and what is the function of GH in
terms of cell growth? - GH act in a synergist manor with other hormones
- GH helps determine what kind of cells form to make skeletal, muscular, and nervous tissue
Why is too much GH not beneficial even though it is the main growth hormone? Too much GH will
inhibit growth
What is the purpose of DIO2 (deiodinase) in its relationship with the the thyroid hormones and their
activity? Changes T4 to T3 to make it more active
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