specific cells Flashcards
1
Q
red blood cell (no nucleus, mitochondria, endoplasmic reticulum)
A
- contains haemoglobin → which binds easily with oxygen and transports it around the body
- circular, biconcave shape → increasing surface area to volume ratio for faster diffusion of oxygen in and out of the cell
- lacks nucleus → to store more haemoglobin for transportation of oxygen
2
Q
root hair cells (numerous mitochondria → ATP for active transport)
A
- long and narrow root hair extension → increase surface area to volume ratio for faster osmosis of water molecules and diffusion of mineral salts in and out of cell
3
Q
xylem vessels (cellulose cell wall, dead tissues, no cell content)
A
- long, hollow and continuous tubes without cross-walls → to transport water from roots to leaves with no obstruction
- lacks protoplasm → so there is no resistance to water flow
- walls thickened with lignin → to provide structural/mechanical support and prevent collapse of vessel during transport of water