Which of the following statements is true?     Fast glycolytic fibers have a small diameter.     Fast glycolytic fibers contain loosely packed myofibrils.     Fast glycolytic fibers have large glycogen reserves.     Fast glycolytic fibers have many mitochondria.

Muscles relaxatiom occurs when acetylcholine is cleaved from its receptors ,calcium is pulled back into the sarcoplasmic recticulum,the myosin is released from its binding site ,and the muscle fiber returns to its resting lenght true or false

A bands: Dark areas that correspond to the areas where thick filaments are present. • I hands: Light areas that contains only thin filaments. . Z line: A protein disk within the I band that anchors the thin filaments and connects adjacent myofibrils. • H zone: Located in the middle of each A band, this lighter stripe appears corresponding to the region between the thin filaments. • M line: Protein fibers that connect neighboring thick filaments. Sarcomeres: The region of the myofibril between two Z lines. ** Keep in mind, this information is crucial for your understanding of the sliding filament theory.

Why is sarcoplasmic hypertrophy a limitation with size training? It adds more actin and myosin. It decreases glycogen content of the muscle cell. It adds mass that is not able to produce force. It results in greater stores of intracellular fat.

Which of the following shortens in length during skeletal mucle contraction? select all that apply Action filaments H- zone A- band  I- band

Which is the correct order from smallest to largest?     Myofilament, Myocyte, Myofibril     Myocyte, Myofilament, Myofibril     Myocyte, Myofibril, Myofilament     Myofilament, Myofibril, Myocyte

Classify characteristics of skeletal muscle energy metabolism by dragging each statement to its correct metabolic pathway for ATP synthesis. Allows time for the other two pathways to increase their ATP production Reaction is catalyzed by creatine kinase Blood glucose and fatty acids become fuel for this pathway after 10 minutes of exercise Lactic acid is a waste product produced by this pathway Rapid means of forming ATP during the first few seconds of muscle contraction Very rapid, requiring only a single enzymatic reaction Produces ATP used during moderate, prolonged levels of muscular activity This pathway requires oxygen Produces a significant fraction of ATP during high-intensity Produces ATP from glucose quickly in the absence of охудen Uses glycogen broken down into glucose during the first 5-10 minutes of moderate exercise Produces only small quantities of ATP for each metabolized glucose molecule exercise Oxidative Phosphorylation Creatine Phosphate Glycolysis Reset

Which of the following is thought to be cause of  muscular fatigue? Decrease level of lactate within the muscle cell Decrease level of extracellular potassium outside of muscle cell Increased level of acetylcholinesterase in the synaptic cleft  Increase level of intracellular ATP within muscle cell Increase level of phosphate within muscle cell

Match each band or line with the type of myofilament with which its associated

In which type of muscle fibers is ATP synthesized aerobically in mitochondria?                                 smooth                                 cardiac                                 skeletal                                 all of the above 2. In which types of muscle fibers are action potentials transmitted from one cell to the next through gap junctions?                                 unitary smooth and cardiac                                 cardiac and skeletal                                 skeletal and smooth   3. All types of muscle have actin and myosin, but not all types have sarcomeres."  True    False