What is described by the Frank-Starling mechanism of the heart?
A. The relationship between arterial blood pressure and stroke volume
B. The relationship between length and tension in cardiac muscle cells
C. The relationship between end-systolic volume and stroke volume
D. The relationship between sympathetic stimulation and stroke volume
E. The relationship between end-diastolic volume and heart rate
Answer: B
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When an embryo implants in the wall of the fallopian tube, it is called
A. placenta previa. B. endometriosis. C. erythroblastosis fetalis. D. stillbirth. E. ectopic pregnancy.
Blood in the heart chambers provides some nutrients to the heart muscle cells.
Indicate whether the statement is true or false.
Ventilation refers to the
A. gas exchange between the blood and the tissues. B. respiration at the cellular level. C. movement of air into and out of the lungs. D. transportation of oxygen and carbon dioxide in the blood. E. gas exchange between the air in the lungs and the blood.
The term "codon" refers to
A. an amino acid that is coded for by three bases of DNA. B. a three-nucleotide sequence of DNA that codes for a protein. C. a three-base sequence of mRNA. D. the part of tRNA that is a triplet of bases that forms hydrogen bonds with complementary sequences. E. the part of a rRNA molecule where a new amino acid is added.