List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
What will be an ideal response?
Ectoderm gives rise to nervous tissues, epidermis and its derivatives. Mesoderm gives rise to muscle and connective tissues and the epithelia of the excretory and reproductive systems. Endoderm gives rise to the epithelial lining of most of the digestive and respiratory tracts and associated glands.
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Which of the following is the time from the onset of labor to the complete dilation of the cervix?
a) Stage of dilation b) Stage of expulsion c) Placental stage d) Gestation e) Effacement
The brain region that provides output to the respiratory muscles is located in the
a. pons b. medulla c. cerebral cortex d. cerebellum e. hypothalamus
The exchange of O2 and CO2 between the external environment and lungs is known as ____________________
Fill in the blank(s) with correct word
In contrast to mammals, the lungs of birds are comparatively
a. small and inelastic. b. large and inelastic. c. small and more elastic. d. large and more elastic.