Nerve and muscle are considered ____________________ tissues because they produce electrical signals when excited
Fill in the blank(s) with correct word
excitable
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Which of the following statements regarding contraction in skeletal and smooth muscle is TRUE?
A. In skeletal muscle, calcium initiates contraction by binding to myosin light-chain kinase, while in smooth muscle calcium initiates contraction by binding directly to tropomyosin. B. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding to calmodulin. C. In skeletal muscle, calcium ions bind to a regulatory protein on thin filaments; in smooth muscle, calcium ions bind to a regulatory protein on thick filaments. D. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding directly to myosin. E. All of the choices are true.
Which is the correct sequence of arteries that a drop of blood would flow through as it entered the kidney and moved toward a glomerulus?
A. Renal artery - interlobar artery - segmental artery - arcuate artery - interlobular artery B. Renal artery - segmental artery - interlobar artery - arcuate artery - interlobular artery C. Arcuate artery - interlobular artery - segmental artery - interlobar artery - renal artery D. Interlobar artery - segmental artery - interlobular artery - renal artery - arcuate artery E. Segmental artery - interlobar artery - interlobular artery - renal artery - arcuate artery
Complement fragments in a tissue or circulation stimulate all of the following EXCEPT ________.
A. chemotaxis B. antibody production C. histamine release D. opsonization
Myosin is also known as the
A. intermediate myofilament. B. sarcomere. C. short myofilament. D. thin myofilament. E. thick myofilament.