During ventricular systole (contraction):
a. the ventricles relax.
b. blood flows from the ventricles into the atria.
c. the tricuspid and mitral valves are open.
d. blood flows from the ventricles to the pulmonary artery and aorta.
e. the atria contract.
D
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In some regions, butterflies are emerging earlier than the flowering of herbaceous plants. This is an issue because
A) butterflies rely on the flowers for food. B) butterflies rely on the flowers for shelter. C) butterflies rely on the flowers to deposit eggs. D) herbaceous plants rely on butterflies for food.
Women taking birth control pills are more likely to have ________
A) babies B) decreased blood pressure C) increased STDs D) fewer abnormal blood clots
Salt-water and fresh-water fish both maintain similar blood osmotic pressures, and NaCl concentrations, which are also similar to humans. Explain the ionic and osmotic challenges faced by salt and freshwater fish, and how they manage to homeostatically maintain blood ionic concentrations and osmotic pressures.
What will be an ideal response?
The repair of a stalled replication fork may be initiated because its structure resembles
a. a Holliday junction. b. a pyrimidine dimer. c. a transcription bubble. d. a base-pair mismatch. e. viral DNA.