In the first few seconds of skeletal muscle contraction, what is the main mechanism by which ATP is replenished?
A. Energy and phosphate are transferred from creatine phosphate to ADP.
B. Oxidative phosphorylation rapidly generates ATP from glucose.
C. Glycolysis produces ATP from glycogen.
D. Oxidation of fatty acids into ATP occurs in the mitochondria.
E. Myoglobin catalysis produces ATP.
A
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Sandwiched between the layer of circular and longitudinal muscle in the muscularis externa is the
A) mucosa. B) submucosa. C) muscularis mucosa. D) myenteric plexus. E) submucosal neural plexus.
A hemoglobin molecule is composed of
A) just two protein chains. B) four protein chains and four heme groups. C) four heme groups but no protein. D) just four protein chains and nothing else. E) just three protein chains.
The sternoclavicular joint is a saddle joint with a ________ range of movement.
A. wide B. narrow
The levator palpebrae superioris muscle
A. contributes to laughing and smiling. B. contributes to pouting. C. raises the eyelid. D. puckers the mouth for kissing. E. causes crow's feet wrinkles.