| 单词 | sarcoplasm |
| 例句 | Figure 16.18 A skeletal muscle fiber is surrounded by a plasma membrane called the sarcolemma, with a cytoplasm called the sarcoplasm. Concepts of Biology 2013-04-25T00:00:00Z Figure 29.34 A skeletal muscle cell is surrounded by a plasma membrane called the sarcolemma with a cytoplasm called the sarcoplasm. Biology for AP Courses 2022-06-09T00:00:00Z Myoglobin is found in the sarcoplasm and acts as an oxygen storage supply for the mitochondria. Anatomy and Physiology 2013-06-19T00:00:00Z By this time the parasite has greatly distended the muscle-fibre in which it has hitherto lain, absorbing, with its growth, practically all the contractile-substance, until it is surrounded only by the sarcolemma and sarcoplasm. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Within the sarcolemma are minute fibrils and a semiliquid substance, called the sarcoplasm. Physiology and Hygiene for Secondary Schools As long as Ca++ ions remain in the sarcoplasm to bind to troponin, and as long as ATP is available, the muscle fiber will continue to shorten. Anatomy and Physiology 2013-06-19T00:00:00Z This can only happen in the presence of calcium, which is kept at extremely low concentrations in the sarcoplasm. Biology for AP Courses 2022-06-09T00:00:00Z The membrane of the cell is the sarcolemma; the cytoplasm of the cell is the sarcoplasm. Anatomy and Physiology 2013-06-19T00:00:00Z The sliding can only occur when myosin-binding sites on the actin filaments are exposed by a series of steps that begins with Ca++ entry into the sarcoplasm. Anatomy and Physiology 2013-06-19T00:00:00Z ATP-driven pumps will move Ca++ out of the sarcoplasm back into the SR. Anatomy and Physiology 2013-06-19T00:00:00Z You will recall that the diameter of a muscle fiber can be up to 100 μm, so these T-tubules ensure that the membrane can get close to the SR in the sarcoplasm. Anatomy and Physiology 2013-06-19T00:00:00Z The trigger for calcium release from the sarcoplasmic reticulum into the sarcoplasm is a neural signal. Biology for AP Courses 2022-06-09T00:00:00Z Figure 10.4 Muscle Fiber A skeletal muscle fiber is surrounded by a plasma membrane called the sarcolemma, which contains sarcoplasm, the cytoplasm of muscle cells. Anatomy and Physiology 2013-06-19T00:00:00Z Ca++ ions are pumped out of the sarcoplasm into the SR, and cross-bridge cycling stops, returning the muscle fibers to their resting state. Anatomy and Physiology 2013-06-19T00:00:00Z It is believed that treppe results from a higher concentration of Ca++ in the sarcoplasm resulting from the steady stream of signals from the motor neuron. Anatomy and Physiology 2013-06-19T00:00:00Z When the thin filaments slide past the thick filaments, they pull on the dense bodies, structures tethered to the sarcolemma, which then pull on the intermediate filaments networks throughout the sarcoplasm. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 10.24 Muscle Contraction The dense bodies and intermediate filaments are networked through the sarcoplasm, which cause the muscle fiber to contract. Anatomy and Physiology 2013-06-19T00:00:00Z It is the arrival of Ca++ in the sarcoplasm that initiates contraction of the muscle fiber by its contractile units, or sarcomeres. Anatomy and Physiology 2013-06-19T00:00:00Z The influx of extracellular Ca++ ions, which diffuse into the sarcoplasm to reach the calmodulin, accounts for most of the Ca++ that triggers contraction of a smooth muscle cell. Anatomy and Physiology 2013-06-19T00:00:00Z However, a low concentration of calcium remains in the sarcoplasm to maintain muscle tone. Anatomy and Physiology 2013-06-19T00:00:00Z The actin sites are exposed after Ca++ enters the sarcoplasm from its SR storage to activate the troponin-tropomyosin complex so that the tropomyosin shifts away from the sites. Anatomy and Physiology 2013-06-19T00:00:00Z Both fatty acid droplets and glycogen are stored within the sarcoplasm and provide additional nutrient supply. Anatomy and Physiology 2013-06-19T00:00:00Z |
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