A. iron B. vitamin B C. vitamin C D. sodium E. calcium 27. B. increase in blood sugar levels C. decrease in most cells' uptake of sucrose from the blood D. A and C E. B and C 28. A. cretinism B. Grave's disease C. due to goiter D. myxedema E. a condition in which the person has a low metabolic rate, low temperature, and slow heart rate 29. The following are True-False statements. The proteins myosin and ATP are principle structural components of all muscle fibers.
Most hormones reach their target cells via the blood circulatory system.
Nerve cells have action potentials, whereas muscle, tendon and bone cells do not. Unlike hormones, local chemical messengers are destroyed rapidly and therefore do not affect distant cells. Ligaments connect muscle to bone, tendons connect bone to bone.