Explain how a lever system can work at a mechanical disadvantage but still be useful in moving a load. What type of lever system fits this description?
What will be an ideal response?
Answer: A lever system that operates with the load far from the fulcrum and the effort applied near the fulcrum is operating at a mechanical disadvantage in terms of power. Third-class levers work at a mechanical disadvantage. Although third-class levers have a disadvantage in terms of force, they exchange it for advantages in speed of movement and distance through which the load is moved.
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Chemistry is important to the study of physiology because
A. the foods that we eat are chemicals. B. chemical reactions enable our bodies to extract energy from nutrients. C. body functions depend on cellular functions that reflect chemical changes. D. All of the answer choices are correct.
What bone is continuous with the nasal septum and the braincase? (
What will be an ideal response?
Which lymphatic organ removes old or damaged red blood cells and contains white blood cells that fight infections?
A) thymus B) spleen C) palatine tonsils D) cisterna chyli
If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be ________.
A. flaccid paralysis B. complete tetanus C. fatigue D. incomplete tetanus E. spasm