During muscle contraction, only the thin filaments shorten. only the sarcomere shortens. only the thick filaments shorten. both the thick filaments and the sarcomere shorten.

Where is energy trapped inside the organelle chlorophyll

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above