Control and Coordination

Quick Revision

• Coordination helps an organism respond appropriately to internal and external stimuli.
• Neurons transmit nerve impulses.
• Reflex action is a rapid and automatic response.
• The spinal cord participates in many reflex actions.
• The brain is the main coordinating centre of the nervous system.
• Plants coordinate responses through growth movements and chemical signals.
• Auxin plays an important role in plant growth and phototropism.
• Adrenaline prepares the body for rapid action.
• Thyroxine helps regulate metabolism.
• Insulin helps regulate blood glucose concentration.