Cross-bridges are portions of
A) myosin molecules
B) tropomyosin molecules
C) actin molecules
D) calcium ions
E) troponin molecules
A) myosin molecules
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The hormone insulin enhances the transport of glucose into body cells. Its secretion is controlled by a negative feedback system between the concentration of glucose in the blood and the cells that secrete insulin. Which of the following statements is most likely to be correct?
A. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration. B. A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration. C. A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration still further. D. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration still further.
In the spinothalamic pathway, the sensory neuron that synapses with a neuron in the cerebral cortex is called the ________ neuron
A) first-order B) second-order C) third-order D) fourth-order E) receptive
Articular cartilage
A. is formed at the epiphyseal plate. B. forms bursal fluid. C. covers the ends of bones in synovial joints. D. attaches tendons to bones. E. produces red blood cells.
The vertebral arteries join to form the:
a. basilar artery b. communicating artery c. subclavian artery d. middle cerebral artery