For relaxation to occur,
A. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close.
B. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open.
C. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close.
D. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.
Answer: C
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Spatial summation occurs in a postsynaptic neuron
a. when several EPSPs from a single presynaptic input sum to reach threshold. b. when EPSPs from several presynaptic inputs sum to reach threshold. c. upon simultaneous interaction of an EPSP and an IPSP. d. when several IPSPs from a single presynaptic input sum to hyperpolarize the membrane. e. none of these answers.
The vitamin that is a constituent of coenzyme FAD is
A) thiamine (B1). B) riboflavin (B2). C) niacin (nicotinic acid). D) folate (B9). E) cobalamin (B12).
Glycolysis
a. yields two molecules of ATP for each molecule of glucose processed b. yields two molecules of NADH when converting one glucose into two pyruvates c. does not take place in the mitochondrion d. all of these e. yields two molecules of ATP for each molecule of glucose processed, and yields two molecules of NADH when converting one glucose into two pyruvates
Oligodendrocytes form a regeneration tube to guide a regenerating nerve fiber to its proper destination
Indicate whether the statement is true or false