Tag: circulatory pathways

Questions Related to circulatory pathways

Choose the correct answer from the alternatives given.
Which of the following is the part of a closed, but not an open, circulatory system?

types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. Heart

  2. Haemocoel

  3. Capillary beds

  4. Ostia

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Correct Option: C
Explanation:

In an open circulatory system, the blood is not confined within blood vessels. The blood bathes the organs and tissues directly. Because of this the blood and the interstitial fluid have no distinction. Thus, the term hemolymph is used. The hemolymph is pumped by the heart through the vessels into the sinuses and then to the surrounding cells where the exchange of materials occur. The hemolymph is taken back to the heart through the ostia that close via the valves during heart contraction.

So, the correct option is 'Capillary beds'.

State whether the following statements are true or false.
The oxygen carrying pigments are mostly dissolved in blood plasma in a closed circulatory system.

types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. True

  2. False

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Correct Option: B
Explanation:

Oxygen carrying pigment haemoglobin are present as separate entities and not found dissolved in plasma like inorganic salts. 

So, the correct option is 'False'.

Choose the correct answer from the alternatives given.
In the sinuses of an open circulatory system,-blood is not segregated from:

types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

  1. urine

  2. interstitial fluid

  3. digestive cavity

  4. cytoplasm

Show answer
Correct Option: B
Explanation:

The open circulatory system is common to molluscs and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. So, the blood is not segregated from interstitial fluid.

So, the correct option is 'Interstitial fluid'.