Which of the following best describes the function of mechanoreceptors in the general senses?
Detection of chemical changes
Detection of mechanical stimuli such as pressure and vibration
Detection of light stimuli
Detection of temperature changes
The Correct Answer is B
A. Detection of chemical changes: Chemoreceptors respond to chemical stimuli, such as changes in oxygen, carbon dioxide, or pH, rather than mechanical forces.
B. Detection of mechanical stimuli such as pressure and vibration: Mechanoreceptors are specialized to sense physical deformation of tissues, including pressure, vibration, touch, and stretch, providing critical information about the environment and body position.
C. Detection of light stimuli: Photoreceptors in the eyes detect light and are not involved in sensing mechanical changes.
D. Detection of temperature changes: Thermoreceptors respond specifically to heat or cold, not to mechanical forces like pressure or vibration.
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Related Questions
Correct Answer is C
Explanation
A. Humerus: The humerus is the long bone of the upper arm, connecting the shoulder to the elbow. It is not associated with the term “collarbone.”
B. Scapula: The scapula, or shoulder blade, is a flat triangular bone located on the posterior side of the ribcage. It does not serve as the collarbone.
C. Clavicle: The clavicle is commonly known as the collarbone. It is a long, slender bone that connects the sternum to the scapula, providing support and stability to the shoulder and allowing a wide range of arm movement.
D. Sternum: The sternum, or breastbone, is a flat bone located in the center of the chest. It articulates with the clavicles but is not referred to as the collarbone.
Correct Answer is B
Explanation
. Producing mucus for the respiratory tract: Mucus is produced by goblet cells in the airway lining to trap dust, microbes, and other particles, not by alveoli.
B. Gas exchange between oxygen and carbon dioxide: Alveoli are tiny, thin-walled sacs at the end of bronchioles. Their large surface area and close association with pulmonary capillaries allow efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.
C. Filtering dust particles from inhaled air: Filtration occurs primarily in the nasal passages, cilia, and mucus of the upper and lower airways, not within the alveoli.
D. Maintaining the shape of the lungs: Lung shape is maintained by the thoracic cavity, connective tissue, and surfactant, while alveoli function mainly in gas exchange.
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