• Movement is an?action by an organism?causing a?change of position or place
• The movement of an organism from place to place is called?locomotion
• Plants cannot move from place to place but can change their?orientation
  • For example, sunflowers track the sun and so change their orientation throughout the day

   

Sunflowers track the sun throughout the day

• Living organisms must control their internal environment in order to keep conditions within?required limits
• This is called?homeostasis

Homeostasis in humans

• Thermoregulation refers to the control of body temperature
• The optimum?human body temperature is?37°C
  • If body temperature?increases?e.g. during exercise, mechanisms for control will be initiated to?return the temperature?back to the optimum
  • Mechanisms include?sweating or vasodilation

   

• Other homeostatic mechanisms in humans include?glucoregulation?(control of blood glucose levels) and?osmoregulation?(control of water levels)

Thermoregulation is an example of homeostasis required to maintain a body temperature of 37°C

Homeostasis in plants

• Plants use?transpiration?to maintain a suitable?temperature
• Water?evaporates?from the?stomata?on the underside of the leaf, leading to?heat loss

Plants maintain an optimum temperature through transpiration

轉載自savemyexam