1) 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.

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light-years

magnitude

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

c is the answer to this question. altitude affects the weather because air molecules evaporate.