Problem 1 - Campbell Biology

Question

\begin{equation} \begin{array}{l}{\text { Which of the following sensory receptors is }} \\\ {\text { incorrectly paired with its category? }} \\ {\text { (A) hair cell- mechanoreceptor }} \\ {\text { (B) snake pit organ-thermoreceptor }} \\\ {\text { (C) taste receptor-chemoreceptor }} \\ {\text { (D) olfactory receptor-electromagnetic receptor }}\end{array} \end{equation}

Step-by-Step Solution

Answer

D) olfactory receptor-electromagnetic receptor

Step 1: Identify Sensory Receptors and Their Categories

List the sensory receptors given in the problem and their corresponding categories. The receptors and their categories are: (A) hair cell-mechanoreceptor, (B) snake pit organ-thermoreceptor, (C) taste receptor-chemoreceptor, (D) olfactory receptor-electromagnetic receptor.

Step 2: Check the Correct Pairings

Review each pairing to determine if it is correct. Hair cells are associated with mechanoreceptors as they respond to mechanical stimuli. Snake pit organs are thermoreceptors as they detect temperature. Taste receptors are chemoreceptors because they respond to chemical stimuli.

Step 3: Determine the Incorrect Pairing

Identify the incorrect pairing by process of elimination. The olfactory receptors are actually chemoreceptors, not electromagnetic receptors. Thus, the pairing of olfactory receptor with electromagnetic receptor is incorrect.

Key Concepts

mechanoreceptor

Mechanoreceptors are sensory receptors that respond to mechanical forces.
These include vibrations, pressure, touch, and sound waves.
Hair cells in the inner ear are prime examples of mechanoreceptors as they detect sound vibrations.

Other examples include:

• Skin receptors that sense touch and pressure.
• Proprioceptors in muscles and joints that provide information about body position and movement.

Mechanoreceptors play essential roles in our day-to-day experiences.
They help us maintain balance, coordinate movements, and perceive the environment around us.

thermoreceptor

Thermoreceptors detect changes in temperature.
They are found in the skin and some internal organs.
Snake pit organs are specialized thermoreceptors that allow snakes to detect infrared radiation, sensing heat from warm-blooded prey.

Human thermoreceptors have two main types:

• Cold receptors: Respond to decreases in temperature.
• Warm receptors: Respond to increases in temperature.

These receptors help regulate our body temperature by prompting appropriate physiological responses such as sweating or shivering.

chemoreceptor

Chemoreceptors respond to chemical stimuli.
They play a key role in taste and smell.
Taste receptors are found on the tongue and respond to different chemical compounds found in food and beverages.
Similarly, olfactory receptors are located in the nasal cavity and detect airborne chemical molecules, allowing us to perceive smells.

Besides taste and smell, chemoreceptors are also essential for monitoring internal body conditions:

• They help detect changes in blood pH, oxygen, and carbon dioxide levels.
• These receptors can be found in carotid bodies and aortic bodies, which help regulate respiratory activity.

electromagnetic receptor

Electromagnetic receptors are sensitive to various forms of electromagnetic energy.
The most well-known electromagnetic receptors are photoreceptors in the eyes, which detect light.
Here are the two main types of photoreceptors:

• Rods: Sensitive to low light and necessary for night vision.
• Cones: Detect color and are active in brighter light conditions.

Unlike mechanoreceptors, thermoreceptors, and chemoreceptors, electromagnetic receptors do not respond to physical or chemical changes but rather to variations in light intensity and color.