What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
B) Tropomyosin is the chemical that activates the myosin heads.
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.
A
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When a skeletal muscle fiber contracts, the
A) H bands and I bands get larger. B) zones of overlap get larger. C) Z lines move further apart. D) width of the A band increases. E) All of the answers are correct.
A platelet plug is formed when fibrinogen is converted to fibrin
Indicate whether the statement is true or false
Cells from a woman with Turner syndrome have
A) only one X chromosome. B) one X and two Y chromosomes. C) no sex chromosomes. D) an extra X chromosome.
Which type of connective tissue forms most of the skeleton before it is replaced by bone?
A. Fibrocartilage B. Dense irregular elastic tissue C. Elastic cartilage D. Dense regular collagenous tissue E. Hyaline cartilage