M********r
发帖数: 179 | 1 由于都是有图的题目，发不了附件。所以只好把下载链接留在这里，供大家讨论及解答
，先行谢过！
http://freemedicalbooks.webs.com/nbme.htm
Block 4 q23:
it showed a ventilatory response to decreasing levels of inspired oxygen
concentration. asked how the curve will change after removal of carotid body.
I think the carotid body is responsible for peripheral low O2 NOT
responsible for central input. therefore, if you cut the carotid body, the
peripheral input would be disappeared but after a period time delay the
central input(accumulation of CO2) would work(consider this is an
experimental animal), so it will induce the cushing reaction-hypertention,
bradycardia(reflex of increased sympathetic response) and respiratory
depression.
My answer is e.
Block 4 Q46:
Asked FRC at the end of normal expiration.
My answer is E but the key says it’s C. 2.5L= volume of the chest wall-
volume of the lung. really have no idea why it’s C not E. |
d****y
发帖数: 2180 | 2 Medmaomier, 我记得这两道题版上都讨论过。你找找看 |
M********r
发帖数: 179 | 3 谢谢dailsy, 找到了第一道，第二道没有找到，好像题目并不难，谁能帮忙解释一下，
万分感谢。
另：怎样才能发附件？
body.
【在 M********r 的大作中提到】
: 由于都是有图的题目，发不了附件。所以只好把下载链接留在这里，供大家讨论及解答
: ，先行谢过！
: http://freemedicalbooks.webs.com/nbme.htm
: Block 4 q23:
: it showed a ventilatory response to decreasing levels of inspired oxygen
: concentration. asked how the curve will change after removal of carotid body.
: I think the carotid body is responsible for peripheral low O2 NOT
: responsible for central input. therefore, if you cut the carotid body, the
: peripheral input would be disappeared but after a period time delay the
: central input(accumulation of CO2) would work(consider this is an
|
R****0
发帖数: 138 | 4 NBME5, Block 4 Q46: FRC occurs where the sum of the 2 pressures (inward pull
of lung and outward pull of chest wall) are equal and opposite, so only
answer D (2L) shows this balance. |
d****y
发帖数: 2180 | 5 第二道
http://www.mitbbs.com/article_t/MedicalCareer/31418459.html
【在 M********r 的大作中提到】
: 谢谢dailsy, 找到了第一道，第二道没有找到，好像题目并不难，谁能帮忙解释一下，
: 万分感谢。
: 另：怎样才能发附件？
:
: body.
|
R****0
发帖数: 138 | 6 NBME5 Block 4 q23
Both carotid body and aortic body are mainly responsible for peripheral low
O2 NOT sensitive to high O2. The inspired O2 and ventilation curve is steep
at low O2 concentration and becomes flat at high O2. When the bilateral
carotid bodies are removed, only no signals from carotid bodies are sent to
central respiratory center, the slightly reduced, but not totally diminished
, O2-ventilation response is observed in answer E. |
M********r
发帖数: 179 | 7 再次感谢daisyy！ 这样的题，本来是明白frc的时候压力为0的，可是题目出得很灵活
，看来还是需要吃透才行啊。
谢谢RBC120详细的解释，现在完全明白了，觉得看书还是不到位。
这两道题都很不错的说。 |
M********r
发帖数: 179 | 8 再感叹一句，这里的高人真是多啊！而且又耐心帮忙解答，再次感谢！ |
