Which of the following is responsible for the falling phase of an action potential?
a. opening of Na+ gates
b. Na+-K+ pump restoring the ions to their original locations
c. greatly increased permeability to Na+
d. Na+ efflux
e. none of these
E
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A neural tube defect called __________ __________ occurs when the vertebrae fail to develop properly and the spinal cord is exposed.
Fill in the blank(s) with the appropriate word(s).
Young ruminants actually function as ________________________________________
Fill in the blank(s) with correct word
The sympathetic nervous system has its cells of origin in the brain stem as well as the spinal cord
Indicate whether the statement is true or false
The notable hardness of bone is attributed to ________.
the presence of inorganic hydroxyapatites the presence of glycoproteins the presence of collagen fibers the presence of cartilage the presence of proteoglycans