The neural tube and neural crest cells are of endodermal origin.
Answer the following statement true (T) or false (F)
False
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________ are barrel-shaped, protein-digesting organelles in both the nucleus and the cytoplasm.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements related to the "ON pathway" of the visual system is correct?
A. Bipolar cells spontaneously depolarize in the absence of input from photoreceptor cells. B. Glutamate receptors on bipolar cells are excitatory. C. Only cones are associated with bipolar cells of the "ON pathway," rods are not. D. Bipolar cells fire action potentials only when bright light strikes the photoreceptors linked to them. E. Bipolar cells hyperpolarize in the absence of input from photoreceptor cells.
HCG is secreted by the ovary
Indicate whether the statement is true or false.
What is the average size (in diameter) of a typical human cell?
a. about 100 micrometers b. about 10 to 20 micrometers c. about 1 micrometer d. about 10 millimeters e. about 1 millimeter