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satela [25.4K]
4 years ago
12

Hannah wants to improve her cardiorespiratory fitness levels so she begins to alternate running on a flat track with running up

stadium stairs. This principle is known as...
A: Type
B: Tedium
C: Time
D: Frequency
Health
1 answer:
Vika [28.1K]4 years ago
4 0

Hi !

<em />

<em>Hannah wants to improve her cardiorespiratory fitness levels, so she begins to alternate running on a flat track with running up stadium stairs. This principle is known as</em> tedium.

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Which of the following BEST describes varicose veins? A. Veins cannot prevent the backflow of blood. B. Veins lose the ability t
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<u>When the venous valves do not work, the blood is not transported properly, backflow occurs and is retained, producing dilation of the vein walls, which is characteristic of varicose veins</u>. In this case, veins cannot prevent the backflow of blood.

The other options are not correct because:

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