Paper 1, Oct Nov 2006 | Cambridge AS - A Level Biology (9700) Past Papers
CIE
AS & A Level
Biology (9700)
بهمن
2006
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 دقیقه
پیش نمایش صفحه اول فایل
Neda Bani What maintains the steep concentration gradients needed for successful gas exchange in the lungs?
1) Air flow in the alveoli is in the opposite direction to blood flow in the capillaries.
2) Blood arrives in the lungs with a lower oxygen concentration and a higher carbon dioxide concentration than the air in the alveoli.
3) Blood is constantly flowing through and out of the lungs, bringing a fresh supply of red blood cells.
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