Which is TRUE about glycolysis?
A. It does not occur in the absence of O2.
B. It does not occur in the presence of O2.
C. It may result in the formation of two molecules of lactate for each molecule of glucose.
D. It is a series of metabolic reactions that occur mainly inside the inner membrane of a mitochondrion.
E. It is a metabolic reaction in which glucose is manufactured from large carbohydrates like glycogen.
C
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The bone disease ________ is a degenerative disorder characterized by thinning bones.
A. osteoporosis B. osteitis C. osteomyelitis D. osteosarcomas
Which functional feature best describes the manner in which cardiac muscle contracts?
Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle cells. Refractory periods in cardiac contractions are relatively short. Only some motor units contract in cardiac muscle. Nerve fibers must stimulate cardiac muscle cells for them to contract.
Why do steroids take so long to generate change when they bind to intracellular receptors?
A) The intracellular receptors have very slow kinetics. B) The bound receptors affect gene transcription rates. C) The steroid receptor complex activates signal transduction pathways. D) The steroid receptor complex must then exit the cell to exert its effects.
Which of the following muscles is(are) the most important in swallowing?
A. Masseter B. Pharyngeal constrictors C. Digastric D. Platysma E. Mentalis