Nuclear ____________ are open passageways that penetrate fused regions of the double membrane of the nuclear envelope
Fill in the blank with correct word.
pores
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The neural arch is formed by the
A. two pedicles and two laminae. B. two pedicles, two laminae, and body. C. two pedicles and body. D. two laminae and body.
What is the function of the transverse tubules in a skeletal muscle fiber?
A. They allow action potentials to propagate deep into the center of skeletal muscle cells. B. They run in parallel with the myofibrils, and have abundant Ca2+-ATPase proteins for pumping Ca2+ back into the sarcoplasmic reticulum. C. They manufacture and store ATP. D. They form the Z lines that mark the end of each sarcomere. E. They store the calcium ions that are the main source of activation for the cross-bridge cycle.
The ________ help to prevent prolapse of the atrioventricular valves during ventricular systole.
What will be an ideal response?
Lysosomes degrade bacteria and worn cells, and can cause disease by destroying normal tissues.
a. true b. false