Saliva is
A) stimulated by sympathetic innervation.
B) slightly acidic, with a pH of 6-7.
C) secreted from endocrine glands.
D) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system.
E) controlled by the autonomic nervous system.
D) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system.
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The smallest unit capable of carrying out the processes associated with life is the ____________________
Fill in the blank(s) with correct word
In which of these cells would you expect the ATP concentration to be the highest?
A. Exhausted cells B. Dead cells C. Active cells D. Resting cells
Explain why the propagation of action potentials along electrically excitable membranes occurs in only one direction
A) The refractory period prevents it from propagating back in the direction from which it began. B) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the positive pole. C) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the negative pole. D) The stimulation of electrically excitable membranes by neurons occurs on only one side of the membrane so it will travel to the other side. E) The repolarization period prevents it from propagating back in the direction from which it began.
Excessive relaxation of muscles in the upper airways, causing airway collapse is the most common reason for __________ sleep apnea.
A. hormonal B. neurological C. vascular D. obstructive