Hair and nails are both special keratinized products
Indicate whether the statement is true or false
T
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In the blastocyst, the trophoblast will become __________, whereas the embryoblast will become __________.
A. part of the placenta; the yolk sac B. part of the placenta; the embryo C. the embryo; part of the placenta D. the embryo; the yolk sac E. the yolk sac; the embryo
Specialized ________ in the carotid and aortic bodies are activated by a decrease in PO2 and pH or an increase in PCO2. What do they trigger?
Fill in the blank(s) with the appropriate word(s).
The region of the optic nerve lacking photoreceptor cells is known as the ________.
A) retina B) optic disc (blind spot) C) choroid D) iris
What structure connects the free margins of the AV valve cusps to the papillary muscles?
A) trabeculae carneae B) endocardium C) chordae tendineae D) myocardium