Differences in uncut hair length result from
A) variations in hair growth rate.
B) duration of the hair growth cycle.
C) variations in the thickness of individual hairs.
D) the quality of conditioning treatments received.
E) both variations in hair growth rate and duration of the hair growth cycle.
E) both variations in hair growth rate and duration of the hair growth cycle.
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Cristae are found in the
a. lysosome b. mitochondrion c. nucleolus d. nucleus e. rough ER
Implantation usually begins at about the end of the first ________ of development.
A. week B. trimester C. day D. month
Select the correct statement about the function of myocardial cells
A) The refractory period in skeletal muscle is much longer than that in cardiac muscle. B) Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate. C) The entire heart contracts as a unit or it does not contract at all. D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
What structure cools the warm blood from the testicular artery?
A. Dartos muscle B. Ductus deferens C. Cremaster muscle D. Pampinform plexus