When ________, blood is forced into the ventricles.
A. the atria contract and the ventricles relax
B. the atria relax and the ventricles contract
C. both the atria and the ventricles relax
D. both the atria and the ventricles contract
Answer: A
You might also like to view...
Describe the phases of the uterine cycle
What will be an ideal response?
The largest salivary gland is the ________ gland, and its duct opens near the second upper molar.
Fill in the blank(s) with the appropriate word(s).
All of the following are associated with the joints of the vertebral column except
A) syndesmoses. B) synchondroses. C) synovial. D) saddle joint. E) pivot joint.
The structure that overlies the organ of Corti and is attached to the tips of the hair cells is the
A) tectorial membrane. B) perilymph. C) stapedius. D) endolymph. E) basilar membrane.