alleryStart learning →About how many human red blood cells would fit across the head of a pin?
ARoughly 250 cells
BRoughly 25 cells
CRoughly 2,500 cells
DRoughly 25,000 cells
Answer & Solution
Correct answer: A. Roughly 250 cells
1. A pinhead measures about two thousandths of a meter, that is two millimeters, across.
2. A human red blood cell measures about eight micrometers across.
3. Dividing the pinhead width by the cell width gives roughly 250.
4. About 250 red blood cells fit on the head of a pin.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_
Keep practising Cell Structure
Browse all Cell Structure questions for CSIR NET, or explore more Biology topics.
Related questions
What do gap junctions and plasmodesmata have in common?Why are gap junctions especially important in cardiac muscle?How many connexin proteins arrange themselves to form one connexon?Desmosomes keep cells in sheets in which kinds of tissue?A desmosome is built from cadherins linked to which cytoskeletal element?Tight junctions in the lining of the urinary bladder serve which purpose?Which two proteins predominantly hold a tight junction together?Which tissues carry out most of the long-distance transport of water in a plant?