The structure in the fetus that allows the blood to bypass the lungs is the:
a. ductus venosus
b. ductus arteriosus
c. foramen ovale
d. both B and C above
d. both B and C above
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The three modifications of the small intestine mucosa that greatly increase the surface area available for absorption are ____________________, ____________________, and ____________________
Fill in the blank(s) with correct word
The tip region of the photoreceptor cells are removed by cells of the retinal pigment epithelium by ________.
A. phagocytosis B. opsin C. apoptosis D. the bleaching reaction
The individual pressure exerted independently by a particular gas within a mixture of gases is known as its ______________
a. diffusion pressure b. partial pressure c. gradient pressure d. equilibrium pressure e. total pressure
John experienced a cut that severed the tendon that attaches the insertion of the gastrocnemius muscle. As a result of this injury, what action is difficult for him to perform?
A) inversion of the foot B) eversion of the foot C) plantarflexion D) dorsiflexion