Muscle can transform ______ into mechanical energy.
ATP
Kinetic energy
Potential energy
DNA
Myoglobin
The Correct Answer is A
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.
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Related Questions
Correct Answer is D
Explanation
Choice A reason: Perforating canals (also known as Volkmann's canals) connect the central canals of different osteons and allow blood vessels and nerves to travel across bone. While they contribute to nutrient transport, they do not directly facilitate exchange between osteocytes.
Choice B reason: Lamellae are concentric rings of bone matrix within osteons. They provide structural support but do not directly mediate nutrient or waste exchange between osteocytes.
Choice C reason: Central canals (Haversian canals) contain blood vessels and nerves and run longitudinally through osteons. They help deliver nutrients to the bone but do not directly connect individual osteocytes.
Choice D reason: Canaliculi are microscopic channels that connect osteocytes within lacunae to each other and to the central canal. These channels allow for the direct exchange of nutrients and waste products between osteocytes, making them the most direct structure for this function.
Correct Answer is B
Explanation
acromion is a projection of another bone.
Choice B reason: The scapula is the correct answer. The acromion is a bony process on the scapula that extends laterally over the shoulder joint and articulates with the clavicle to form the acromioclavicular joint.
Choice C reason: The ulna is a forearm bone and does not have an acromion. It forms part of the elbow joint.
Choice D reason: The scaphoid is a carpal bone in the wrist and is unrelated to the shoulder girdle or the acromion.
Choice E reason: The pollex refers to the thumb and is not associated with the acromion or shoulder anatomy.
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