The highest concentration of cone cells in the retina can be found in which region?
a. Conjunctiva
b. Fovea
c. Limbus
d. Optic disk
e. Ora serrata
ANS: B
Cones are concentrated in a thinned-out region of the retina, the fovea centralis, which possesses the highest degree of visual acuity.
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Which of the following is/are found only in the PNS?
A. Nerves B. Astrocytes C. Unmyelinated axons D. Myelin E. Lipofuscin
Which digestive structure is commonly called the "throat?"
A) Esophagus B) Pharynx C) Oral cavity D) Small intestine
When our inner ears convert sound energy into neural impulses or our retinas convert light into neural impulses,
A. no heat is generated, and so it is an exception to the first law of thermodynamics. B. it is an exception to both laws of thermodynamics, because no usable energy is lost. C. it is consistent with the second law of thermodynamics, but an exception to the first. D. the conversion is consistent with both laws of thermodynamics.
IgG antibodies
A) are found in glandular secretions.
B) bind antigens in the extracellular fluid to B cells.
C) stimulate the release of histamine and other inflammatory chemicals.
D) are the first antibody type secreted, following initial exposure to an antigen.
E) can also cross the placenta and provide passive immunity to the fetus.