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Active transport and diffusion.
Glucose is transported by active transport, against the concentration gradient, from the gut into intestinal epithelial cells. Whereas glucose is transported by facili...

Contain haemoglobin - a molecule that can bind reversibly to oxygen. Biconcave disk shape - increases surface area to allow more diffusion of oxygen. No nucleus - allows more space for haemoglobin. Flexib...

Osmoreceptors in the hypothalamus detect the increase in water concentration. This stimulates the pituitary gland to release less ADH. This reduces the amount of ADH in the blood and so, reduces the amoun...

Nucleus- controls the activity of the cellMitochondria- site of aerobic respirationCytoplasm- site of biochemical reactions, including anaerobic respiration Cell membrane- Allows transport of materials in...

Biconcave discs- to increase surface area for oxygen carriage Haemoglobin- increases affinity for oxygen uptake at the lungs. However, at the respiring tissues, the increased CO2 concentration allow relea...