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 A
Explanation
Choice A reason: ATP (adenosine triphosphate) is the primary energy currency of the cell. Muscle cells use ATP to power the contraction process, converting chemical energy into mechanical energy through the interaction of actin and myosin filaments.
Choice B reason: Kinetic energy is the result of movement, not the source of energy for muscle contraction. Muscles generate kinetic energy, but they do not transform it into mechanical energy.
Choice C reason: Potential energy refers to stored energy, such as in a stretched elastic band. While muscles can store potential energy in elastic components, the transformation into mechanical energy is driven by ATP.
Choice D reason: DNA carries genetic information and plays no direct role in energy transformation during muscle contraction.
Choice E reason: Myoglobin stores oxygen in muscle cells but does not provide energy. It supports aerobic metabolism, which ultimately produces ATP, the actual energy source.
Correct Answer is C
Explanation
Choice A reason: This is incorrect. Tropomyosin does not block myosin; it blocks the active sites on actin filaments, preventing myosin binding until calcium binds to troponin.
Choice B reason: Tropomyosin is not a chemical activator. Activation of myosin heads occurs through ATP hydrolysis and calcium-mediated exposure of actin binding sites.
Choice C reason: This is correct. Tropomyosin is a regulatory protein that wraps around actin filaments and blocks myosin-binding sites. When calcium binds to troponin, tropomyosin shifts, exposing these sites and allowing contraction to proceed.
Choice D reason: Tropomyosin does not function in the synaptic cleft nor inhibit calcium there. Calcium regulation in the synaptic cleft involves neurotransmitter release mechanisms, not tropomyosin.
Choice E reason: Tropomyosin is not a receptor. The receptor for motor neuron neurotransmitters (e.g., acetylcholine) is the nicotinic acetylcholine receptor located on the sarcolemma of the muscle cell.
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