Why is the circulatory system of an earthworm | vedclass

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Question

(B) The circulatory system of an earthworm is classified as a closed type because the blood is always confined within a network of closed blood vessel

Vedclass · Accepted Answer

Because blood is confined to blood vessels and capillaries.

Vedclass · Answer

(B) The circulatory system of an earthworm is classified as a closed type because the blood is always confined within a network of closed blood vessels and capillaries. Unlike open circulatory systems where blood flows into body cavities (sinuses),in the earthworm,the blood is pumped by the heart through a series of closed vessels,ensuring efficient transport of nutrients and gases throughout the body.

Column-$I$	Column-$II$
$P$. Septal nephridia	$I$. $15^{th}$ segment to the last segment
$Q$. Integumentary nephridia	$II$. $4^{th}, 5^{th}$ and $6^{th}$ segments
$R$. Pharyngeal nephridia	$III$. $3^{rd}$ segment to the last segment

Why is the circulatory system of an earthworm called a closed type of circulatory system?

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