Which of the following precursor cells give rise to granular leukocytes?
a) Proerythroblast
b) Megakaryoblast
c) Lymphoblast
d) Myeloblast
e) None of the selections are correct.
d
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The movement of rotating a limb toward the anterior surface of the body is called ________ rotation
A) frontal B) external C) lateral D) outward E) medial
The __________ is the layer of the heart wall composed of cardiac muscle tissue.
Fill in the blank(s) with the appropriate word(s).
In excitation-contraction coupling,
A. calcium ions must bind with myosin to expose active sites on actin. B. myosin heads bind to exposed active sites on actin. C. cross-bridges form between myosin heads and calcium ions. D. movement of the troponin-tropomyosin complex causes actin myofilaments to slide. E. ATP binds to actin myofilaments.
Which statement about erythrocytes is true?
A. Erythrocytes are biconcave in shape. B. Erythrocytes are round, multinucleated cells. C. Erythrocytes function to transport oxygen and carbon monoxide. D. Erythrocytes function to fight off infection.