Explain the ABCDE rule used to distinguish melanomas from other skin cancers and from normal moles
What will be an ideal response?
A is for an asymmetrical shape (the two sides do not match). B is for border irregularity. C stands for color, usually blue-black or a variety of colors. D is for the diameter (generally larger than 6 mm, the size of a pencil eraser). Finally, E is for an evolving (changing) shape and size.
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If all of the calcium within a muscle fiber was removed, which of the following could still occur?
The heads of the myosin myofilaments bind to G-actin to form cross-bridges. An action potential that was produced at the neuromuscular junction is propagated along the sarcolemma. The troponin molecules bound to G actin molecules are released, causing tropomyosin to move. The heads of the myosin molecules return to their resting position and the recovery stroke occurs.
The primary curves of the vertebral column are the
A. thoracic and sacral curvatures. B. lumbar and sacral curvatures. C. cervical and thoracic curvatures. D. cervical and lumbar curvatures.
The display of chromosome pairs arranged by size and similar features is known as the
A. genotype. B. Punnet square. C. karyotype. D. heredity gel.
Which of the following is NOT a function of joints?
A) Joints enable movement. B) Joints provide stability. C) Joints allow long bones to lengthen. D) All joints allow a wide variety and range of motions.