The structure indicated by the letter “B” above
represents
a. actin.
b. myofibril.
c. myosin.
d. sarcoplasmic reticulum.
e. muscle fiber.
Answer: d
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Viruses that cause acute infection result in productive infections
Indicate whether this statement is true or false.
Steroid hormones ____
a. are proteins b. include testosterone, estrogens, and cortisol c. never activate second messengers d. never alter membrane transport of ions e. are large nonpolar molecules
Glycolysis depends upon a continuous supply of
glucose and a. NADP. b. pyruvate. c. NAD+. d. NADH. e. H2O.
When you hold your breath, which of the following blood gas changes leads initially to the urge to breathe again?
A) rising oxygen concentration B) rising carbon dioxide concentration C) falling oxygen concentration D) falling carbon dioxide concentration