biology: Adaptations for survival
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Definition: a trait or feature of an organism that helps and organism survive or reproduce in its environment.
- Behavioural: what we do
- Structural: what we possess
- Physiological: how our body functions
Xylem: vascular tissue that conducts water and the woody element in the stem.
Phloem: vascular tissue that conducts sugars and other metabolic products (food) downwards from the leaves.
Stomata: any of the minute pores in the epidermus of the lead or stem of a plant, forming a slit of variable width that allows movement of gases in and out of the intercellular spaces.
Respiration + Photosynthesis
- glucose + oxygen --- carbon dioxide + water + energy
- carbon dioxide + water (suns energy) glucose + oxygen + water (chlorphyll)
Components in the body
Vein: takes blood back to the heart, therefore less muscle and elastic tissue. Presense of valve so no back flow.
Artery: takes blood away from the heart. Lots of muscle for strength and lots of elastic for pressure.
Capillary: takes oxygen and food back to cells and collects carbon dioxide and waste. Very tiny between cells. very think walls (1 cell thick). thich for easy diffusion.
Red blood cells: takes oxygen to cells. high surfec aread. high haemaglobin. no nucleaus or mitochondira. 120 days then recycled.
White blood cells: big and smurfy. engulf bacteria (immunity). move two cells out of capillaries.
Platelets: clots up cuts and injuries. fragments of cell.
Plasma: carry cells around body. distribute heat. is a liquid.
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