Cell Size and Shape (VCE SSCE Biology): Flashcards
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No. of cells in human body
No. of cells in human body
~37.2 trillion cells
Largest human cell & its diameter
Largest human cell & its diameter
Ovum, ~0.1 mm diameter
Red blood cell diameter
Red blood cell diameter
~7 micrometres (µm) or 0.007 mm
Red blood cell shape
Red blood cell shape
Biconcave disc (indented both sides)
Why small cells exchange materials efficiently
Why small cells exchange materials efficiently
High surface area to volume ratio (SA:V)
Intracellular transport benefit in small cells
Intracellular transport benefit in small cells
Shorter distances = faster molecule movement
SA:V relationship with cell size
SA:V relationship with cell size
Smaller objects have larger SA:V ratios
Volume measurement units
Volume measurement units
Cubic units: mm³, cm³, m³
Villi function in small intestine
Villi function in small intestine
Finger-like projections that increase SA for nutrient absorption
SA:V: elongated vs compact shapes (same volume)
SA:V: elongated vs compact shapes (same volume)
Elongated shapes have higher SA:V ratios