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 D
Explanation
A. Providing structural support: While bones provide structural support for the body, osteoclasts do not contribute to this directly. Their activity actually breaks down bone tissue, which is part of the remodeling process that ultimately maintains bone strength and integrity.
B. Producing red blood cells: Red blood cells are produced in the red bone marrow through hematopoiesis. Osteoclasts indirectly influence this by remodeling bone to maintain marrow cavities, but they do not produce blood cells themselves.
C. Forming new bone: Osteoblasts are responsible for forming new bone by synthesizing and mineralizing the bone matrix. Osteoclasts work in conjunction with osteoblasts, resorbing bone to allow space for new bone deposition and maintaining bone turnover balance.
D. Breaking down bone tissue: Osteoclasts are specialized cells that resorb bone, breaking down the mineralized matrix and releasing calcium and phosphate into the bloodstream. This process is essential for bone remodeling, repair, and maintaining mineral homeostasis in the body.
Correct Answer is A
Explanation
A. Long bone: The femur is a long bone characterized by a tubular shaft (diaphysis) and two expanded ends (epiphyses). Long bones function primarily in support, movement, and bearing weight, and they contain bone marrow for blood cell production.
B. Short bone: Short bones are roughly cube-shaped, such as the carpals and tarsals, and provide stability with limited movement. The femur does not fit this shape or functional classification.
C. Flat bone: Flat bones, like the sternum and skull bones, are thin and often protect internal organs. The femur’s cylindrical structure does not match that of flat bones.
D. Irregular bone: Irregular bones have complex shapes, such as the vertebrae, to serve specialized functions. The femur’s simple long shape distinguishes it from irregular bones.
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