When ________, blood pressure within the ventricles increases, which causes the AV valves to close and the semilunar valves to open.
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: B
You might also like to view...
The space between two neurons is called the ________.
A. synapse B. terminal button C. vesicle D. soma
When the blood becomes hypertonic (too many solutes), antidiuretic hormone (ADH) is released. What is the effect of ADH on the kidney tubules?
What will be an ideal response
In a fetus, the umbilical arteries arise from the renal arteries.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. The right hypochondriac region contains the majority of the stomach. 2. Lungs carry out an excretory function. 3. Embryology concerns the structural changes that occur in an individual from conception through old age. 4. A tissue consists of groups of similar cells that have a common function. 5. It is important for any organism to maintain its boundaries, so that its internal environment remains distinct from the external environment surrounding it.