Which of the following does NOT contribute to the increase of breathing rate during exercise?
A. Stimulation of the respiratory areas by decreasing blood concentration of oxygen and increasing blood concentration of carbon dioxide
B. Stimulation of the respiratory areas by sensory impulses from proprioceptors
C. A joint reflex
D. Signals from cerebral cortex to skeletal muscles are also sent to the respiratory areas
Answer: A
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With regard to the healing of a skin wound, macrophages ___________.
A. release histamine to increase blood flow to the area B. produce and secrete collagenous fibers C. phagocytize and digest tissue debris D. stimulate epithelial cells to multiply E. make capillaries more permeable, allowing white blood cells to migrate into the area
In general, the substances in the filtrate that need to be conserved are selectively reabsorbed whereas the unwanted substances that need to be eliminated fail to be reabsorbed
Indicate whether the statement is true or false
Name the four characteristics of muscles: _________________________, __________________________, _________________________, and _________________________.?
Fill in the blank(s) with correct word
Cross-bridges are portions of
A) actin molecules. B) myosin molecules. C) troponin molecules. D) tropomyosin molecules. E) calcium ions.