Mean arterial pressure can be increased by all of the following EXCEPT
A) increasing heart rate.
B) increasing sympathetic activity.
C) increasing blood volume.
D) decreasing end-diastolic volume.
E) increasing venous return
Ans: D) decreasing end-diastolic volume.
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Variation among individuals in a species is usually caused by:
A. environmental variation. B. genetic variation. C. infectious variation. D. both environmental variation and genetic variation. E. environmental variation, genetic variation, and infectious variation.
Through studies using the animal cap assay this morphogen was shown to be important for the determination of the different types of mesoderm tissue in the developing embryo.
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
Which of the following statements is(are) true of
homeotic genes? a. More than one hundred of them have been identified. b. The same mechanisms control their transcription regardless of the species. c. Many of them are functionally interchangeable among species. d. They likely evolved in the most ancient eukaryotic cells. e. All of these are true.
Which of the following is a bacterium associated
with severe lung infection that requires a skin test or x-ray to identify? a. jock itch b. Bacillus subtilis c. Mycobacterium tuberculosis d. Staphylococcus epidermidis e. none of these