Explain how modern birth control pills work as contraceptives.
What will be an ideal response?
Birth control pills contain hormones such as estrogen that act through negative feedback to inhibit the release of GnRH, which in turn prevents release of FSH and LH. Thus primordial follicles do not develop and ovulation is prevented.
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The order of impulse conduction in the heart, from beginning to end, is __________.
SA node, bundle branches, bundle of His, AV node, and Purkinje fibers. SA node, bundle of His, AV node, bundle branches, and Purkinje fibers. SA node, AV node, bundle of His, bundle branches, and Purkinje fibers. SA node, bundle branches, AV node, bundle of His, and Purkinje fibers
The type of fibers specialized to continue contracting for extended periods of time, as would be required in running a marathon, for example, are ________ fibers.
A. intermediate B. fast and intermediate C. fast D. slow E. slow and intermediate
What is the only sense in which signals can reach the cerebral cortex without passing first through the thalamus?
A. Touch B. Smell C. Taste D. Vision E. Equilibrium
Which of the following is gray matter?
A) nerves B) tracts C) neural cortex D) ganglia E) columns