SPECIALISED CELLS Modifications of Cell Structure for Specific
- Slides: 19
SPECIALISED CELLS Modifications of Cell Structure for Specific Functions
Objectives: 1) Describe how some cells are modified for specific functions: � A root hair cell - absorption � A xylem vessel – conduction & support � A red blood cell – oxygen transport 2) State the relationship between cell structure and function
Types of Specialized Cells: 1. The Root Hair Cell 2. The Xylem Vessel 3. The Red Blood Cell
The Root Hair Cell
The Root Hair Cell
The Root Hair Cell Water molecules Cytoplasm
Larger vacuole Long & narrow
Do root hairs contain chloroplasts ? NO!!
Absorption by root hair cell
The Root Hair Cell Specialization of root hair cell Function 1. Long and narrow Increases surface area to 2. Grows outwards from absorb water and minerals the roots 1. Has a very large vacuole Absorbs as much water as possible
The Xylem Vessel
The Xylem Vessel
Transport of water in xylem
The Xylem Vessel
The Xylem Vessel Specialization of xylem vessel 1. Shape is long, narrow and tube-like 1. Has a thick wall of lignin Function Conducts water and minerals from the roots up to the stems and leaves Provides mechanical strength (support)
The Red Blood Cell Colour? Shape?
Red Blood Cell
The Red Blood Cell Specialization of xylem vessel 1. Biconcave disc 1. No nucleus Function Its shape gives large surface area to pick up and release oxygen Cytoplasm can contain more haemoglobin So more oxygen can be transported