Which of the following is NOT a function of the skeletal system?
Communication
Support
Storage of minerals
Production of blood cells
Anchorage for muscles
The Correct Answer is A
Choice A reason: Communication is not a direct function of the skeletal system. While the skeletal system supports structures involved in communication (e.g., the skull housing the brain), it does not itself facilitate communication.
Choice B reason: Support is a primary function of the skeletal system. It provides a rigid framework that supports the body and maintains its shape.
Choice C reason: The skeletal system stores essential minerals such as calcium and phosphate, which can be released into the bloodstream as needed.
Choice D reason: Hematopoiesis, or the production of blood cells, occurs in the red bone marrow found within certain bones. This is a vital function of the skeletal system.
Choice E reason: Bones serve as anchoring points for muscles, allowing movement through the leverage of joints and tendons.
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Related Questions
Correct Answer is B
Explanation
Choice A reason: Microfilaments are components of the cytoskeleton found in many cell types, including muscle cells, but they are not the structural and functional unit of skeletal muscle.
Choice B reason: The sarcomere is the correct answer. It is the smallest contractile unit of skeletal muscle, composed of actin and myosin filaments arranged in a precise pattern. Sarcomeres are responsible for the striated appearance and contraction of skeletal muscle.
Choice C reason: The sarcoplasmic reticulum is an organelle that stores and releases calcium ions necessary for muscle contraction. While essential, it is not the structural and functional unit.
Choice D reason: Trabeculae are structural elements found in spongy bone, not muscle tissue. They do not play a role in muscle contraction.
Choice E reason: A fascicle is a bundle of muscle fibers, not the smallest functional unit. It is a larger structural grouping within the muscle
Correct Answer is E
Explanation
Choice A reason: The platysma is a superficial neck muscle involved in depressing the mandible and tensing the skin of the neck. It is not associated with facial expressions like smiling.
Choice B reason: The masseter is a powerful jaw muscle responsible for chewing. It does not contribute to smiling or ceremonial expressions.
Choice C reason: The sternocleidomastoid is a neck muscle involved in head rotation and flexion. It is not used in facial expressions.
Choice D reason: The orbicularis oris encircles the mouth and is responsible for movements like puckering or closing the lips. While it may be involved in kissing, it is not the primary muscle used for smiling.
Choice E reason: The zygomaticus muscle, specifically the zygomaticus major, elevates the corners of the mouth and is the primary muscle used in smiling. It is commonly activated during joyful expressions, such as those seen in wedding ceremonies.
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