The main muscle used in breathing is the ____
a. diaphragm
b. transversus abdominis
c. internal oblique
d. quadratus
a
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How would the absolute refractory period be affected if voltage-regulated sodium channels failed to inactivate?
A) It would last indefinitely. B) It would be much briefer. C) It would be basically unaffected.
A curve ball pitch follows which path?
A. straight line with sudden break at the end B. smooth arc C. can be either A or B D. none of the above
What are the divisions and functions of the muscular system?
A) The axial division support and position the axial skeleton and the appendicular division support and move the limbs. B) The axial division support and move the limbs and the appendicular division support and position the appendicular skeleton. C) The axial division support and move the head, neck, arms, and trunk and the appendicular division support and move the legs. D) The axial division support and move the legs and the appendicular division support and move the head, neck, arms, and trunk. E) The axial division support and position the head and neck and the appendicular division support and move the trunk and limbs.
Assuming you have normal respiratory function at sea level, start holding your breath. Which of the following could be true in 60 seconds?
A. The oxygen-hemoglobin dissociation curve is shifting to the left B. Venous PO2 = 50 mmHg C. Arterial PCO2 = 50 mmHg D. Alveolar PO2 = 105 mmHg