These receptors detect specific molecules in our external and internal environments.
A. Photoreceptors
B. Mechanoreceptors
C. Thermoreceptors
D. Chemoreceptors
E. Baroreceptors
Answer: D
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Which of the following is not true regarding the right atrioventricular valve?
A) It has 3 cusps. B) It is also called the tricuspid valve. C) It prevents backflow of blood from the right ventricle into the right atrium. D) The valve closes when the right atrium contracts. E) The cusps provide one-way flow of blood.
All of the following are muscles that move the eyeball EXCEPT
a) superior rectus. b) lateral rectus. c) inferior oblique. d) internal oblique. e) superior oblique.
Graded potentials that increase the likelihood of an action potential bring the ________ closer to threshold.
Fill in the blank(s) with the appropriate word(s).
The permeability of the plasma membrane to mineral ions:
A. is not influenced by channels formed by proteins. B. is the same in all cell types. C. is affected by differences in electrical charge on the two sides of the membrane. D. is zero in all living cells. E. is only possible because of the hydrophobic interior of the lipid bilayer.