Blood flow to the skin ________.
A) is controlled mainly by decreasing pH
B) increases when environmental temperature rises
C) increases when body temperature drops so that the skin does not freeze
D) is not an important source of nutrients and oxygen for skin cells
B) increases when environmental temperature rises
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When blood passes through systemic capillaries, the oxygen saturation of hemoglobin changes
A. from about 98% to about 75% saturated. B. from about 40% to about 80% saturated. C. from about 70% saturated to about 99% saturated. D. from about 99% saturated to about 25% saturated.
The I band contains
A) thick and thin filaments. B) thick filaments only. C) thin filaments only. D) myosin only.
Why do marine osmoconformers use organic osmolytes in their ICF to attain osmotic balance instead of the more easily available inorganic osmolytes such as sodium, potassium and chloride ions?
a. because organic osmolytes can be easily absorbed from the sea water b. because organic osmolytes do not disrupt the function of macromolecules c. because the cells can make organic osmolytes without using cellular energy d. because the cells have to use energy to obtain inorganic osmolytes
The motor division is also called the ________ system; the sensory division is also called the ________ system.
A. afferent; efferent B. efferent; afferent