At rest, active sites on the actin are blocked by
A) Myosin molecules.
B) Troponin molecules.
C) Tropomyosin molecules.
D) Calcium ions.
E) ATP molecules
C) Tropomyosin molecules.
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__________ play an important role in cell division, and they are made of __________.
A. Mitochondria; microtubules B. Ribosomes; intermediate filaments C. Nucleoli; microfilaments D. Centrioles; microtubules E. Inclusions; centrosomes
Preganglionic neurons of the autonomic nervous system are located in
A) the brain. B) the lateral gray horns of the spinal cord. C) the posterior gray horns of the spinal cord. D) both the brainstem and the lateral gray horns of the spinal cord. E) the cerebrum.
Cardiovascular diseases typically affect
A) young children. B) young women. C) old men. D) old men and old women. E) young men.
What is the equation that correctly depicts the relationship between blood pressure (BP), peripheral resistance (PR), and cardiac output (CO)?
a. BP = CO/PR b. CO = PR/BP c. BP = CO x PR d. CO = PR x BP