Which term refers to a person who has a recessive allele that is not expressed phenotypically?
a) recessive
b) carrier
c) dominant
d) karyotype
b) carrier
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A decrease in neurotransmitter release with repeated action potentials is termed _________
Fill in the blank with correct words.
Define schistosomus reflexus
What will be an ideal response?
Which of the following statements about membrane potentials in different types of cardiac cells is TRUE?
A. Voltage-gated transient (T-type) Ca2+ channels are present in all of the different types of cells of the heart. B. Myocardial cells have a resting membrane potential of about -90 mV; pacemaker cells do not have a true resting membrane potential. C. There are no L-type Ca2+ channels in cardiac muscle cells. D. The upstroke of the action potential is steeper in SA node cells than it is in Purkinje cells. E. Once threshold depolarization is reached in both myocardial and pacemaker cells, the rapid upswing of the action potential is caused by the opening of voltage-gated Na+ channels
The rate and force of heart contractions change to meet the metabolic needs of the tissues which can vary based on different conditions.
a. true b. false