According to the Frank-Starling law of the heart,
a. the shorter the initial length of the cardiac muscle fibers prior to contraction the more forceful will be the subsequent contraction, because the fibers are already partially contracted.
b. increasing the venous return increases the end-diastolic volume, which leads to an increased stroke volume, so the heart normally pumps out all of the blood returned to it.
c. as cardiac output is reduced, blood pools in the vasculature so that arterial blood pressure increases.
d. the output of the left side of the heart must always exceed that of the right side of the heart because the right side only pumps blood to the lungs, whereas the left side must pump blood to the rest of the body.
e. the greater the stroke volume, the smaller will be the subsequent end-diastolic volume because as more blood is squeezed out, the heart cannot fill as completely.
B
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A major lesson we can learn from examining sexual behavior in other cultures is that:
A. all societies regulate the sexual behavior of women in some way, but not that of men. B. culture and learning profoundly influence and are major determinants of human sexual behavior. C.there is relatively little variation across societies in human sexual behavior, which demonstrates the importance of instinct and drive in human sexual behavior. D. human sexual behavior differs significantly from that of other species of mammals.
Which of the labeled cells in the figure is NOT a neuroglial cell?
a) A b) B c) C d) D e) F
Matching
A) A B) C C) D D) B E) E 28) Tricuspid valve. 29) Mitral (bicuspid) valve. 30) Right atrium. 31) Left ventricle. 32) Pulmonary veins.
________ increase surface area to facilitate absorption of extracellular materials
A) Microvilli B) Cilia C) Centrioles D) Endoplasmic reticulum E) Mitochondria