What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin is the name of a contracting unit.
B) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
C) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
D) Tropomyosin is the receptor for the motor neuron neurotransmitter.
B) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
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The glial cell that helps to circulate cerebrospinal fluid is the
A. ependymal cell. B. astrocyte. C. microglial cell. D. oligodendrocyte. E. neurolemmocyte.
What vessels do the right and left external jugular veins drain into?
Which statement accurately describes alveolar exchange of oxygen?
A. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen. B. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. C. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. D. Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen.
What is the function of CRH?
A. To cause a release of TSH B. To cause a release of ACTH C. To cause a release of GH D. To cause a release of LH