The medullary cavity of a long bone is lined with a thin cellular layer called
______.
Fill in the blank(s) with correct word
endosteum
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This epithelium, located in the respiratory tract, is equipped with __________ on its free surface.
Fill in the blank(s) with correct word.
Which of the following is INCORRECT about the numbers of spinal nerves?
A) 5 pairs of sacral spinal nerves B) 12 pairs of thoracic spinal nerves C) 7 pairs of cervical spinal nerves D) 5 pairs of lumbar spinal nerves
The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually
A) cAMP. B) cGMP. C) adenyl cyclase. D) a G protein. E) calcium ion levels.
The CSF produced by the choroid plexus of the brain circulates through the
A) central canal of the spinal cord. B) ventricles of the brain and central canal of the spinal cord. C) dorsal root ganglia of the spinal nerves. D) cervical, brachial, and lumbosacral plexuses. E) ventricles of the brain.