The blind spot of the eye is caused by ________
A) the macula lutea interrupts the nerve pathway
B) there are no photoreceptors where the optic nerve leaves the eye
C) an absents of cones in the foveae
D) more rods than cones within the retina
B
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Because lymphatic vessels have three tunics (intima, media, and externa) and valves, they structurally resemble
A. venules. B. veins. C. arterioles. D. arteries E. All of the choices are correct.
Discuss the evolutionary connection between bilateral symmetry and cephalization in animals
What will be an ideal response?
How does melanin protect the skin from the effects of ultraviolet light?
What will be an ideal response?
Physical connections of the medulla include
A) all fibers connecting the brain to the spinal cord. B) ascending tracts, but not descending tracts, from the brain. C) descending tracts, but not ascending tracts, to the brain. D) direct links between the spinal cord and cerebellarl hemispheres. E) All of the answers are correct.