The end of a skeletal muscle that is attached to a stationary, fixed bone is the origin. The end of a skeletal muscle that is attached to a movable bone is called the
A) hinge. B) insertion. C) joint. D) flexor. E) extensor.
B
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Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?
A. Intermediate filaments are only found in tumor cells. B. Keratin is only present if its specific cell type is also present. C. Intermediate filament proteins cause cells to clump together. D. Answers b and c are both correct.
Explain what happens at the molecular level when a salt such as NaCl dissolves in water
What will be an ideal response?
Which statement is true of Planaria?
a. They have a well-developed circulatory system. b. They have a mouth located in their anterior end. c. They expel wastes via the action of ciliated flame cells. d. They contain a primitive, ladder-like skeletal system.
The Widal test is used for diagnosing salmonellosis.
a. true b. false