What stem cell gives rise to all formed elements?
A) lymphoid stem cell
B) megakaryocyte
C) hemocytoblast
D) myeloid stem cell
E) reticulocyte
C
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The basic contractile unit of a skeletal muscle is the:
a. sarcomere b. actin c. myosin d. Z-lines
A group of cells was treated with a proteolytic (protein-digesting) enzyme. Which of the following processes would be least affected by this treatment?
A. Diffusion of Na+ through membrane channels B. Diffusion of lipid-soluble molecules through the plasma membrane C. Use of carrier molecules in facilitated diffusion D. Secondary active transport E. Sodium-potassium exchange pump
Which of the following wraps and surrounds an individual skeletal muscle fiber?
A) endomysium B) epimysium C) sarcoplasmic reticulum D) perimysium
Muscles with fibers that run perpendicular to the long axis of the body are called
A) lateralis. B) transversus. C) rectus. D) oblique. E) medialis.