biology: Adaptations for survival

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.

• R-
• glucose + oxygen --- carbon dioxide + water + energy

• P-
• carbon dioxide + water (suns energy)  glucose + oxygen + water                             (chlorphyll)

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.