6.1.1 Receptors

• Receptors can detect stimuli from both internal and external environments.


  True
• A physiological response is triggered when a receptor detects a stimulus.

  True
• Receptors enable organisms to adapt to environmental changes.

  True
• What type of stimulus do chemoreceptors detect?

  Chemical stimuli
• When a receptor binds to its specific stimulus, it initiates a physiological response within the organism.
• Environmental adaptation is a key function of receptors, allowing organisms to respond to environmental changes.
• Receptors play a crucial role in maintaining homeostasis in organisms.
• What is a receptor in biology?

  Detects a specific stimulus
• What is the role of a stimulus in receptor function?

  Detects environmental changes
• What is the general function of receptors in organisms?

  Detect specific stimuli
• Match the receptor type with the stimulus it detects:

  Chemoreceptors ↔️ Chemical stimuli

  Photoreceptors ↔️ Light stimuli

  Thermoreceptors ↔️ Temperature stimuli

  Mechanoreceptors ↔️ Mechanical stimuli
• Photoreceptors are responsible for detecting light stimuli.


  True
• Mechanoreceptors detect mechanical stimuli such as touch, pressure, and sound.
• Receptors in the skin detect touch, pressure, and temperature changes.
• Outline the process of stimulus detection and signal transduction:

  1️⃣ Stimulus detection

  2️⃣ Receptor activation

  3️⃣ Signal transduction

  4️⃣ Physiological response
• Signal transduction converts the initial stimulus into an electrical or chemical signal.


  True
• What biochemical change occurs in the receptor during activation?

  Conformational change
• Internal stimuli include light and external stimuli include body temperature.

  False
• Match the receptor type with its stimulus.

  Chemoreceptors ↔️ Chemical stimuli

  Photoreceptors ↔️ Light stimuli

  Thermoreceptors ↔️ Temperature

  Mechanoreceptors ↔️ Mechanical stimuli
• Receptors in the skin detect touch, pressure, and temperature
• Mechanoreceptors in joints allow us to sense touch and sound.

  False
• What is an example of a chemical stimulus detected by chemoreceptors?

  Taste
• Which receptors detect temperature stimuli?

  Thermoreceptors
• Where are receptors located in the human body?

  Throughout the body
• Which organ contains chemoreceptors for detecting taste?

  Tongue
• What change occurs in a receptor when it is activated by a stimulus?

  Conformational change
• Arrange the steps of stimulus detection and signal transduction in the correct order.

  1️⃣ Stimulus detection

  2️⃣ Receptor activation

  3️⃣ Signal transduction

  4️⃣ Physiological response
• What is a receptor in biology?

  A molecule detecting a stimulus
• Receptors are classified based on the type of stimulus
• Where are receptors located in the human body?

  Throughout the body
• What physiological response is triggered by photoreceptors?

  Activation of the visual pathway
• Chemoreceptors in the pancreas sense elevated blood glucose
• Match the receptor type with an example of its stimulus:

  Chemoreceptors ↔️ Taste

  Photoreceptors ↔️ Vision

  Thermoreceptors ↔️ Heat

  Mechanoreceptors ↔️ Touch
• Chemoreceptors in the nose detect the stimulus for smell.

  True
• In the stimulus detection phase, a stimulus binds to a complementary receptor molecule.
• What is the final outcome of signal transduction in a cell?

  Physiological response
• Stimulus detection and signal transduction allow organisms to respond to environmental changes.


  True
• What is the primary function of receptors?

  Detect specific stimuli
• Mechanoreceptors in the skin detect touch and pressure.

  True
• Arrange the steps of stimulus detection and signal transduction in the correct order.

  1️⃣ Stimulus detection

  2️⃣ Receptor activation

  3️⃣ Signal transduction

  4️⃣ Physiological response