The substance commonly transported during facilitated diffusion is ________
A) Glucose B) Potassium C) Cytoplasm D) Sodium
A
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Steroid hormones
A) are proteins. B) cannot diffuse through cell membranes. C) bind to receptors in the nucleus of their target cells. D) act on target cells by activating second messenger cascades. E) are transported in the blood dissolved in the plasma.
Excess accumulation of fluid, which impairs the exchange of materials within the tissues, is called ________
A) stroke B) shock C) edema D) MALT (mucosa-associated lymphatic tissue)
Select the description below that illustrates a difference between a sphincter and circular muscle
A) A sphincter is a thickening of circular muscle that can prevent the movement of digesting materials while circular muscle is involved in propulsion digesting material. B) Sphincters are found throughout the GI tract while circular muscle is found only in the proximal portion of the GI tract. C) A sphincter is composed of smooth muscle while circular muscle is composed of skeletal muscle tissue. D) Sphincters are found in the proximal portion of the GI tract while circular muscle is found in the distal portions.
Each thick filament contains about ________ protein molecules (each molecule has two heads and two braided tails).
A. 2000 B. 200 C. 2 D. 20