Explain the two reasons why graded potentials lose strength as they move through the cell. Why don't action potentials lose strength?
What will be an ideal response?
As a depolarization wave moves through the cell, some of the positive charge is lost to the extracellular fluid through leak channels. Additionally there is cytoplasmic resistance. Action potentials do not lose strength because they are regenerated in each patch of membrane.
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The lateral malleolus is found on which bone?
A. Tibia B. Femur C. Fibula D. Humerus E. Scapula
Formation of new sarcomeres and growth of myofibrils requires which of the following proteins?
A. Nebulin B. Titin C. Obscurin D. All of the choices are correct.
The thoracic cage consists of the
A. coxal bones and sacrum. B. scapulae and clavicles. C. ribs. D. coxal bones. E. ribs and sternum.
Which of the following statements about excitation-contraction coupling is incorrect?
A) Calcium ions travel through the transverse tubule. B) Calcium ion is released from the sarcoplasmic reticulum. C) Tropomyosin moves to expose myosin binding sites on actin. D) Troponin binds calcium ion and signals tropomyosin to move. E) Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.