Open vs Closed Circulatory Systems — NEET Biology
📚 Practice ConceptThe circulatory patterns are of two types – open or closed. Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels. This pattern is considered to be more advantageous as the flow of fluid can be more precisely regulated.
Assertion (A): Closed circulatory systems provide advantages over open circulatory systems. Reason (R): Closed circulatory systems allow more precise regulation of fluid flow compared to open systems.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
Both statements are true from NCERT. NCERT confirms closed systems have advantages (Assertion) and states “This pattern is considered to be more advantageous as the flow of fluid can be more precisely regulated” (Reason). The Reason explains WHY closed systems are advantageous - through precise flow regulation.
What does NCERT say about circulatory patterns are two?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.