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Kamna Agrawal

· started a discussion

· 1 Months ago

should'nt it be option 'c'? (Question: 210192.0 )

Closed Circulatory System:

In this type of circulatory system, the animals like annelids, a few other groups of invertebrates and vertebrates have a completely closed system of vascular channels. A network of minute capillaries unite the small arteries with the veins. Fluid or blood, filters through the wall of the capillaries into the tissue spaces and transfers the nutrient to the cells.
http://www.notesonzoology.com/invertebrates/circulation-system-in-invertebrate-zoology/2051

Question:
What kind of blood transportation system is found in invertebrates ?
Options:
A) Open transportation system
B) Closed transportation system
C) Both A and B
D) None of the above
Solution:
Ans: (a) Invertebrate animals have a great variety of liquids, cells, and modes of circulation, though many invertebrates have what is called an open system, in which fluid passes more or less freely throughout the tissues or defined areas of tissue. All vertebrates, however, have a closed system—that is, their circulatory system transmits fluid through an intricate network of vessels. This system contains two fluids, blood and lymph, and functions by means of two interacting modes of circulation, the cardiovascular system and the lymphatic system; both the fluid components and the vessels through which they flow reach their greatest elaboration and specialization in the mammalian systems and, particularly, in the human body.

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