Ventricular contraction normally begins at the apex (bottom of the heart). What would likely happen if ventricular contraction originated at the intersection of the atria and the ventricles instead?

A) Blood would be pumped through the semilunar valves.
B) Blood would be pumped into the pulmonary artery and aorta.
C) Blood would be pumped back into the atria.
D) Blood would be pumped down to the apex of the heart.


Answer: D

Biology & Microbiology

You might also like to view...

In terms of number of species, the most successful terrestrial vertebrates that invaded the air are  

A.  insects. B.  pterosaurs. C.  birds. D.  bats. E.  flying monkeys.

Biology & Microbiology

An individual travels from one geographic location to another and joins a different population of the same species, introducing a new allele for a characteristic that wasn’t there before that individual’s arrival. This is an example of _______.

a. gene flow b. genetic drift c. mutation d. natural selection

Biology & Microbiology

A few photosynthetic dinoflagellate species are endosymbionts in cells of reef-building corals

What does the dinoflagellate provide to the host coral?

1.Oxygen and carbon dioxide 2.Oxygen and sugar 3.Protection from ultraviolet light 4.Protection from predators

Biology & Microbiology

The primary role of a cytokinin is

a. fruit drop b. cell division c. fruit ripening d. promote flowering e. stress response

Biology & Microbiology