Relate the terms work, energy, potential energy, and kinetic energy to a muscle contraction at the cellular level
What will be an ideal response?
Cells do work when they synthesize complex molecules and move materials into and out of cells. Muscle contraction requires energy. Molecules inside muscle cells store the potential energy of contraction. The potential energy of contraction is converted into kinetic energy when a muscle contracts.
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Pulmonary arteries carry blood to the
A) right atrium. B) left atrium. C) lungs. D) aorta. E) systemic circuit.
The major function of the sarcoplasmic reticulum in muscle contraction is to ________.
A) make and store phosphocreatine B) synthesize actin and myosin myofilaments C) provide a source of myosin for the contraction process D) regulate intracellular calcium concentration
The function of the nucleus is to
A) direct the activities of the cell. B) form mitochondria. C) provide cell shape. D) transfer energy.
Recommended daily allowances established by the Food and Nutrition Board are based on
A. averages obtained from population studies. B. individual needs and factor in sex, age, and body mass.