Question

Write a note on closed circulation.

Answer 1

• Blood circulates throughout the body of all vertebrates, higher mollusks, and annelids via a network of blood arteries.
• Blood travels within blood vessels and does not come into direct contact with cells or body tissues in this form of circulation.
• Material exchange between blood and bodily tissues occurs via an intermediary fluid known as lymph.
• Blood travels at high pressure and contains respiratory pigments such as haemoglobin for the transfer of breathing gases.