During the embryonic stage, the primary germ layers develop from the
A) embryonic disc. B) placenta.
C) blastocyst. D) morula.
A
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As fluid moves out of the glomerular capillaries, it passes through gaps in the podocytes called slit 1) pores, whose size is regulated by what?
A) slit muscle B) slit diaphragm C) corpuscle D) fenestrations E) glomerular capillary
A scientist observes a particular nerve fiber that is among the fastest at conducting action potentials in the body. Which of the following best describes its likely structure?
A. Large diameter and unmyelinated B. Large diameter and myelinated C. Small diameter and unmyelinated D. Small diameter and myelinated
Which of the following is a function of the amnion?
A. It enables the embryo to develop symmetrically. B. It protects the embryo from trauma. C. It limits temperature fluctuation. D. It allows movement and supports muscle development. E. All of the choices are correct.
Athletes abuse erythropoietin (EPO) because this hormone
A) adds protein to plasma. B) increases the number of white blood cells. C) increases the number of red blood cells. D) decreases the number of red blood cells.