The flagellum is used to
A) penetrate the corona radiata.
B) survive.
C) move the sperm to the oocyte.
D) penetrate the oocyte.
E) become capacitated.
C) move the sperm to the oocyte.
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An action potential does not re-stimulate the adjacent membrane that was previously depolarized because
A. stimulation is inhibited by the myelin sheath. B. that area of the membrane is in the absolutely refractory period. C. the resting membrane potential of the axon is too negative. D. the resting membrane potential of the axon is too positive. E. it is impossible for an action potential to be propagated along an axon toward the nerve cell body.
The submandibular ducts open into the floor of the oral cavity, lateral to the lingual frenulum.
Answer the following statement true (T) or false (F)
Which of the following statements is not true?
A. B and T lymphocytes begin development as pluripotent stem cells in red bone marrow. B. B and T lymphocytes develop antigen receptors on their surfaces. C. B and T lymphocytes both complete their development in the thymus gland. D. B and T lymphocytes are involved in innate defense. E. B and T cells that react against the body's own tissue are pruned through the process of negative selection.
Within the bilaminar germinal disc, the layer of columnar cells that is adjacent to the amniotic cavity is the ________ layer.
Fill in the blank(s) with the appropriate word(s).