very annoying ADA sample test QUestion

[Keroro]

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15. Which of the following chiefly stimulates action of the respiratory center?

answer was "Carbon DIoxide in blood"



-> So, is it okay to remeber that
CO2 in blood stimulates out respiratory center ???




19. The addition of potassium iodide as a nutritional supplement to common table salt would most directly affect the function of which of these glands?

a) Thyroid
b) Sweat Glands
c) Adrenal Cortex
d) Kidneys
e) Parathyroid



-> answer is a) Thyroid.. which i can't understand!!

Thyroid only 1. stimulates out metabolism, 2. produce Calcitonin to dec calcium Ion.


I thought answer should be d) Kidney
becaue kidney take care of osmoregulation.
Taking additional potassium iodide over common table salt increased the osmorailty in our blood, and doen't kidney regulate it?

ADH, Adrenal cortex hormone, also does this job, but it is also involved in the kidney. (inc permeable of nephron in the kidney)




Did i misunderstand the question?

or

Did i misunderstand the concept ?



thank you~!

 

[Put144]

15. Which of the following chiefly stimulates action of the respiratory center?




19. The addition of potassium iodide as a nutritional supplement to common table salt would most directly affect the function of which of these glands?

a) Thyroid
b) Sweat Glands
c) Adrenal Cortex
d) Kidneys
e) Parathyroid



-> answer is a) Thyroid.. which i can't understand!!

Thyroid only 1. stimulates out metabolism, 2. produce Calcitonin to dec calcium Ion.


I thought answer should be d) Kidney
becaue kidney take care of osmoregulation.
Taking additional potassium iodide over common table salt increased the osmorailty in our blood, and doen't kidney regulate it?

ADH, Adrenal cortex hormone, also does this job, but it is also involved in the kidney. (inc permeable of nephron in the kidney)







thank you~!

It's not any concept to know, although it's good you're thinking about it. But it's just a random fact, that iodine is needed in order to make T3 and T4, from the thyroid gland. It's all just in the mechanism of how the T3 and T4 is produced in the follicular cells of the thryoid gland. Nothing to really think about, just a random fact.

 

[jkh1886]

15) There are pH receptors in the aortic arch. When the blood gets too acidic, it triggers these receptors. (pH correlates to CO2 levels) This is a basic physiology question.

19) Iodine travels into the basement membrane of the thyroid cells and is converted to T3 and T4.

 

[Keroro]

wow..such a good info



thanx guys !!!!!!!!!!!

 

[IzzyMarieDMD]

You can also remember that table salt was iodized to prevent goiter.... and goiter is a condition of the thyroid. (Not as technical but that's how I remember it)

 

[wireless_doc]

15. Peripheral chemoreceptors in the aortic arch are triggered by a decrease in partial pressure of oxygen (below 60mmHg), an increase in partial pressure of carbon dioxide but not pH. Peripheral chemoreceptors in the carotid body are triggered by all three (low pH or high H+).
Central (medullary) chemoreceptors in the medulla are triggered by an increase in partial pressure of carbon dioxide.
All the three changes can stimulate (increase) the rate of ventilation. Partial pressure of carbon dioxide has the greatest effect.
19. Follicle cells of the thyroid gland synthesize thyroglobulin and secrete it into the colloid-containing regions of the follicles. Thyroglobulin undergoes iodination (iodine attaches to tyrosine molecule of thyroglobulin) and coupling processes that produce the thyroid hormones: thyroxine (T4) and triiodothyronine (T3)

 

[yorkiepoo]

19. i just think about the people with goiter, the thyroid disease, in 3rd world countries that don't get enough iodine in their diet and have inflamed looking thyroids.