Sensory Receptors as Transducers

Role of Sensory Receptors

• Detect stimuli and send nerve impulses.
• Pathway:
  • Sensory receptor → Sensory neuron → Relay neuron → Motor neuron → Effector
• Effectors trigger responses (usually muscles or glands).

Types of Receptors

• Receptors detect various stimuli, converting them into electrical impulses.
• Each receptor acts as a transducer (converts energy from one form to another).

Parsinian Corpuscle

• Location: Found in the skin.
• Function: Detects pressure changes.
• Mechanism:
  • Pressure squashes outer layers, creating gaps in membranes.
  • Spaces open sodium channels.
  • Sodium enters nerve ending, following electrochemical gradient.
  • Generates an action potential.

Understanding Sodium in Nerves

• Sodium channels vital for generating action potentials.
• Further details will be explored in upcoming lessons.

Exam Tips

• Use precise scientific and biological terminology.
• Avoid vague terms such as "it," "they," "amount," or "size."

• Note: Review the function of the parsinian corpuscle once more knowledge about nerve functions is acquired.
• Best of luck with your exams!