Photoreceptors secrete the neurotransmitter

A) glutamate.
B) acetylcholine.
C) norepinephrine.
D) dopamine.


A) glutamate.

Anatomy & Physiology

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Muscles, bones, and connective tissues form from

A) ectoderm. B) mesoderm. C) epiblast. D) epiderm. E) endoderm.

Anatomy & Physiology

Cilia and flagella extend from certain cells, enabling them to move

Indicate whether the statement is true or false

Anatomy & Physiology

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.

Anatomy & Physiology

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.

Anatomy & Physiology