(d) Veins have different structures from arteries. State two features of veins and explain how these features enable them to function efficiently.

1. Featu

Explanation

2. Featu

Explanation​

here's the solution,

Feature 1 : -

veins have thin walls as compared to arteries.

Explaination 1 : -

veins have thin walls, because they have less blood pressure in comparison to arteries and hence.

Feature 2 : -

veins have valves

Explanation 2 : -

veins have valves to stop backflow of blood.

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