Biology F211 Quiz Cells, Exchange and Transport 4.0 / 5 based on 4 ratings ? BiologyASAll boards Created by: HannahCreated on: 10-01-12 19:27 Explain why the walls of capillaries are composed of squamous epithelium cells Squamous epithelial cells are thin, so there is a short diffusion pathway for oxygen and carbon dioxide 1 of 9 State how oxygen is exchanged between tissue fluid and cells diffusion through the phospholipid bilayer 2 of 9 Explain why red blood cells are not found in tissue fluid, but white blood cells are. Red blood cells can't pass through capillary walls, many white blood cells made in lymph nodes and enter blood via lymph 3 of 9 Explain why enlarging a photograph taken with a light microscope does not show more detail Resolution is limited by the wavelength of light used in light microscopes 4 of 9 Explain why samples of biological material are stained before microscope work To give contrast to material 5 of 9 State an adaptation of xylem vessels for transport of water Lignin prevents inward collapse 6 of 9 Explain how roots absorb water from the soil By osmosis, down a water potential gradient, from the soil water into root hair cells 7 of 9 What causes blood to have pressure? The contraction of the left ventricle in the heart 8 of 9 Explain why meiosis is described as a reduction division The number of chromosomes halves- diploid to haploid 9 of 9
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