Open circulatory system can contain_________?
Correct answer: B. White Blood Cells
- A. Red Blood Cells
- B. White Blood Cells
- C. Haemoglobin
- D. All of these
Explanation
Open circulatory systems contain hemolymph, which may include circulating cells called hemocytes that perform functions comparable to white blood cells. Red blood cells and haemoglobin are characteristic of vertebrate blood and are generally absent from the hemolymph of animals with open circulation. Students may choose all of these because they are familiar components of vertebrate blood, but open systems do not generally contain red blood cells or haemoglobin.
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Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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