When arterioles constrict, it raises arterial blood pressure and increases the volume of forward flow into the veins, while constriction in veins reduces forward flow by decreasing pressure in the atria
Indicate whether the statement is true or false.
FALSE
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During concentric isotonic contraction of a skeletal muscle fiber, which of these occurs?
A. Thin filaments shorten B. Sarcomeres lengthen C. A bands lengthen D. I bands shorten E. A bands shorten
A group of girls at a middle school are all suffering from anorexia nervosa. One girl's counselor tells her that it is a serious illness, from which 15 to 21 percent of sufferers die. The counselor is correct.
Answer the following statement true (T) or false (F)
The opening and closing of the heart valves is caused by
A. contraction and relaxation of papillary muscles that pull on heart strings. B. pressure changes of alternating contraction and relaxation during the cardiac cycle. C. contraction of the smooth muscle in the walls of the great vessels leaving the heart. D. action potentials within the cusps of the valves.
A genetic trait controlled by one set of alleles on a gene is termed a:
A) single-gene disorder B) dual-allele disorder C) single chromosome disorder D) none of the above