OCR 1.1.3 Biology

erythocytes:

• Is bioconcave in shape allowing a larger surface area for gas exchanges
• No nucleus which gives more space for haemoglobin

Epithelial Cell:

• Some of epithelial cells have cillia eg in trachea to waft dirt and dust up and out the body

Sperm cell:

• Flagellum to allow it to swim to the egg
• The acrosome contains digestive enzymes to allow it to penetrate the egg cell surface
• Contains lots of mitochondria to give the sperm lots of energy for it to swim

Palisade cells:

• Has thin cells for rapid intake of CO2
• Contains lots of chloroplast so it can absorb alot of sunlight for photosynthesis

Root hair cell:

• Has thin permeable cell to allow rapid intake of water and ions
• Has large surface area for absorption
• The cytoplasm has a lot of mitochondria  to allow active transport

Guard cell:

• Has thin outer wall and a thick inner wall which forces is to bend outwards and open the stomata
• In light they take up water and become turgid