9700/12 Biology May Jun 2016 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
شهریور
2016
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
The large arteries close to the heart have a thick elastic layer in their walls.
Which statements about this layer are correct?
1) helps to maintain the blood pressure in arteries
2) reduces friction within the arteries
3) prevents too much pressure bursting the artery wall