Which of the following statements regarding control of respiration is correct?
A. A slight decrease in arterial PO2 is a stronger stimulus for increased ventilation than is a comparable decrease in arterial PCO2.
B. The most important signal for regulating ventilation is the H+ concentration of arterial blood.
C. Increased concentrations of lactic acid stimulate ventilation primarily by acting on peripheral chemoreceptors.
D. An increase in the HCO3- concentration in blood stimulates ventilation.
E. At high altitude, a decrease in PCO2 of the blood stimulates an increase in ventilation.
C
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Which type of innervation causes the heart rate to increase?
A. Parasympathetic B. Sympathetic
Relaxation is facilitated by the release of passive tension that developed in cablelike ________ proteins that were compressed during contraction.
Fill in the blank(s) with the appropriate word(s).
Another name for the cuticle is the
A. eponychium. B. hyponychium. C. nail matrix. D. nail bed. E. nail root.
This muscle originates on the zygomatic arch and inserts at the angle and ramus of the mandible. It is responsible for closing the jaw
A) masseter B) risorius C) temporalis D) zygomaticus