Which of the following is an accurate description of breathing mechanics?
A. The relaxation of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air.
B. The contraction of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air.
C. The contraction of the diaphragm reduces the thoracic volume, creating a positive pressure that forces air out.
D. The contraction of the diaphragm expands the thoracic cavity, creating positive pressure that draws in air.
Answer: B. The contraction of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air.
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Which of the following muscles adducts the leg at the hip?
A) gluteus Maximus B) gluteus Minimus C) gracilis D) sartorius
Angiotensin II stimulates the adrenal cortex to release aldosterone
Indicate whether this statement is true or false.
Most of the neurons in the brain and spinal cord are
A) nonpolar. B) bipolar. C) multipolar. D) unipolar
The somatic nervous system and the autonomic nervous system are part of both the peripheral nervous system and the central nervous system.
Answer the following statement true (T) or false (F)