4.2 The Blood Vessels (GCSE Biology)

The following is a GCSE Biology test covering '4.2 The Blood Vessels'

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What is the narrow channel within blood vessels called?

What substances diffuse out of cells into capillaries?

Valves are present in veins to?

What does the double circulatory system in humans include?

What type of blood do veins typically transport?

What helps veins prevent the backward flow of blood?

The pathway of blood flow from organs to heart involves which vessels?

What does the circulatory system carry away from cells?

In which organ does the blood gain oxygen in the double circulatory system?

Which vessels specifically ensure blood moves from organs back towards the heart?

Blood from heart to body travels initially through?

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