In which species are platelets normally larger than red blood cells?

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Study for the VTNE Laboratory Procedures Test. Use flashcards and multiple choice questions, each question offers hints and explanations, enabling increased understanding and retention. Prepare effectively for your exam!

Multiple Choice

In which species are platelets normally larger than red blood cells?

Explanation:
The main idea this question tests is how platelet size compares to red blood cell size across species. In domestic mammals—the four options listed—the red blood cells are larger than platelets. Platelets are small cytoplasmic fragments, typically about 2–3 micrometers in diameter, while red blood cells are about 6–8 micrometers. So, in cattle, dogs, horses, and cats, platelets are normally smaller than red blood cells. Because of this, the statement that platelets are normally larger than red blood cells does not hold for these species. If you’re thinking of an example where platelets can appear relatively large, that variation occurs in some species outside this list, such as birds and reptiles, where thrombocytes can be nucleated and similar in size to or larger than erythrocytes.

The main idea this question tests is how platelet size compares to red blood cell size across species. In domestic mammals—the four options listed—the red blood cells are larger than platelets. Platelets are small cytoplasmic fragments, typically about 2–3 micrometers in diameter, while red blood cells are about 6–8 micrometers. So, in cattle, dogs, horses, and cats, platelets are normally smaller than red blood cells.

Because of this, the statement that platelets are normally larger than red blood cells does not hold for these species. If you’re thinking of an example where platelets can appear relatively large, that variation occurs in some species outside this list, such as birds and reptiles, where thrombocytes can be nucleated and similar in size to or larger than erythrocytes.

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