Which of these statements concerning the functional characteristics of the heart chambers is NOT correct?
A. During ventricular diastole, blood collects in the right and left atria.
B. At the very beginning of ventricular diastole, blood flows directly from the atria into the relaxed ventricles.
C. 70% of ventricular filling occurs before the atria contract.
D. During ventricular systole, the atrioventricular valves close.
E. During ventricular diastole, the semilunar valves open.
Answer: E. During ventricular diastole, the semilunar valves open.
You might also like to view...
21. The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observation is that
a. plant cells are capable of having a much higher surface-to-volume ratio than animal cells. b. plant cells have a much more highly convoluted (folded) plasma membrane than animal cells. c. plant cells contain a large vacuole that reduces the volume of the cytoplasm. d. animal cells are more spherical, while plant cells are elongated. e. the basic functions of plant cells are very different from those of animal cells.
In the mutualistic relationship of lichens, ____ provide moisture and attachment while ____ provide food.
A. bacteria; fungi B. bacteria; algae C. fungi; algae D. algae; fungi
If a culture starts with 50 cells, how many cells will be present after five generations with no cell death?
A 200 B. 400 C. 1600 D. 3200
Some ________ use group translocation as a means of transport.
A. eukaryotes B. bacteria C. archaea D. protozoa E. eukaryotes and prokaryotes