Each hemoglobin molecule is composed of four heme groups. The hemo groups contain iron (Fe). How many oxygen molecules can a hemoglobin combine with?
A) one
B) two
C) four
D) eight
Ans: C) four
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Which of the following are paired correctly?
A. Nociceptors-stimulated by blood pressure changes B. Thermoreceptors- stimulated by energy from light C. Baroreceptors-stimulated by damage to tissues D. Proprioceptors- stimulated by tension changes in muscles and tendons
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
Enkephalins produce presynaptic inhibition in neurons transmitting pain signals. Increased levels of enkephalins will
A. increase awareness of pain. B. decrease awareness of pain. C. increase amount of pain. D. decrease amount of pain. E. have no effect on awareness or amount of pain.
Oligodendrocytes make myelin.
Answer the following statement true (T) or false (F)