The buffy coat represents < 1% of the whole blood and is comprised of
a. erythrocytes and platelets
b. leukocytes and platelets
c. leukocytes and clotting factors
d. platelets and clotting factors
e. clotting factors and albumins
B
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The gonads
A. are the male testes and female ovaries. B. secrete sex hormones. C. produce gametes. D. are dormant until puberty. E. All of the choices are correct.
Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers usually inactivate protein kinase enzymes. B) Second messengers usually act to remove nitric oxide (NO) from the cell. C) Cyclic AMP and calcium may be second messengers. D) Second messengers act through receptors called K-proteins.
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.
How does osmosis differ from diffusion?
What will be an ideal response?