Photoreceptors secrete the neurotransmitter
A) glutamate.
B) acetylcholine.
C) norepinephrine.
D) dopamine.
A) glutamate.
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Muscles, bones, and connective tissues form from
A) ectoderm. B) mesoderm. C) epiblast. D) epiderm. E) endoderm.
Cilia and flagella extend from certain cells, enabling them to move
Indicate whether the statement is true or false
Which of the following is not a principle of the cell theory?
a. Most cells come from preexisting cells. b. Cells are the smallest things that can be alive. c. A cell's structure determines the cell's ability to function. d. All cells have certain fundamental structures and functions in common. e. Cells are the fundamental living building blocks of multicellular organisms.
Describe depolarization, repolarization, and hyperpolarization
A) Depolarization is a shift in membrane potential toward a more positive value; repolarization is the return of the membrane potential to resting; and hyperpolarization is a shift in membrane potential toward a more negative value. B) Depolarization is a shift in membrane potential toward a more negative value; repolarization is the return of the membrane potential to resting; and hyperpolarization is a shift in membrane potential toward a more positive value. C) Depolarization is the return of the membrane potential to resting; repolarization is a shift of the membrane potential toward a more positive value; and hyperpolarization is a shift in membrane potential toward a more negative value. D) Depolarization is the return of the membrane potential to resting; repolarization is a shift of the membrane potential toward a more negative value; and hyperpolarization is a shift in membrane potential toward a more positive value. E) Depolarization is a shift in membrane potential toward a more negative value; repolarization is a shift of the membrane potential toward a more negative value; and hyperpolarization is the return of the membrane potential to resting.