Smooth muscles relax when intracellular Ca2+ levels drop but may not cease contractions
Indicate whether the statement is true or false
TRUE
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Where is dystrophin, the protein that is defective in muscular dystrophy, normally found?
A. Between the outermost myofilaments and the sarcolemma of a muscle fiber B. As a transmembrane protein of the sarcolemma C. In the Z discs of skeletal and cardiac muscle D. In the dense bodies of smooth muscle E. Bridging the gap between the sarcolemma and synaptic knob
Endorphins can reduce perception of sensations initiated by
A) nociceptors. B) mechanoreceptors. C) thermoreceptors. D) chemoreceptors. E) proprioceptors.
Match the organelle with its function.
1. The "powerhouse" of the cell, ATP is produced here. 2. These degrade long chain fatty acids and toxic foreign molecules. 3. It is the digestive system of a cell, degrading and/or recycling bacterial or organic components. 4. It modifies proteins and packages them into secretory vesicles for export from the cell. A. endoplasmic reticulum B. Golgi apparatus C. lysosomes D. mitochondria E. peroxisomes
Which would NOT be caused by a decrease in plasma Ca2+ levels in an otherwise normal person?
A. an increase in plasma parathyroid hormone levels B. an increase in plasma 1,25-dihydroxyvitamin D3 levels C. an increase in nerve and muscle excitability D. a decrease in the filtered load of Ca2+ E. an increase in bone density