Match the eye structure with the appropriate description.A. Blood vessels enter and the optic nerve exits hereB. A small yellow spot near the center of the posterior retinaC. The portion of the retina with the greatest visual acuityD. A jelly-like substance in the posterior cavity of the eyeE. The fluid that fills the anterior cavity of the eyeAqueous humor
Fill in the blank(s) with the appropriate word(s).
Answer: E
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The walls of the alveoli
A. contain goblet cells. B. contain several layers of smooth muscle. C. are surrounded by cartilage. D. are ciliated. E. are composed of simple squamous epithelium.
During endochondral ossification the primary center of ossification forms due to :
a. osteoblasts invading a fibrous membrane b. osteoblasts interacting with an embryonic cartilage c. increased mechanical stress on the diaphysis d. osteoclast action on spongy bone
What helps bone resist compression?
A. Inorganic salts B. Endosteum C. Reticular fibers D. Red bone marrow E. Yellow bone marrow
What causes cGMP to convert to GMP and close Na+ channels in a photoreceptor?
A. Light B. Darkness C. Dark current D. Opsin