Arteries differ from veins

in having thick tunica externa.

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as arteries do not have valves.

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as blood flow is slow as compared to veins.

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in having muscular walls.

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Solution

The correct option is B
as arteries do not have valves.

Arteries do not have valves.

$\begin{matrix} A r t e r i e s & V e i n s (i) & C a r r y b l o o d a w a y f r o m t h e h e a r t & C a r r y b l o o d t o w a r d s t h e h e a r t (i i) & B l o o d i s u n d e r g r e a t p r e s s u r e i n a r t e r i e s, h e n c e i t f l o w s & B l o o d i s n o t u n d e r g r e a t p r e s s u r e i n v e i n s, h e n c e i t f a s t, i n s p u r t s, r e f l e c t i n g t h e r h y t h m i c p u m p i n g a c t i o n o f t h e h e a r t . & f l o w s m o r e s l o w l y a n d s m o o t h l y . (i i i) & H a v e t h i c k a n d e l a s t i c m u s c u l a r w a l l s & H a v e r e l a t i v e l y t h i n, s l i g h t l y m u s c u l a r w a l l s . (i v) & H a v e n o v a l v e s . & H a v e s e m i - l u n a r v a l v e s a l o n g t h e i r l e n g t h s t o p r e v e n t b a c k f l o w o f b l o o d . (v) & C a r r y b r i g h t r e d o x y g e n a t e d b l o o d (e x c e p t i o n : & C a r r y d a r k r e d d e o x y g e n a t e d b l o o d (e x c e p t i o n : P u l m o n a r y a r t e r i e s c a r r y d e o x y g e n a t e d b l o o d & P u l m o n a r y v e i n s c a r r y o x y g e n a t e d b l o o d f r o m t h e f r o m t h e h e a r t t o t h e l u n g s) . & l u n g s t o t h e h e a r t) . \end{matrix}$

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