Question
Part V. 7 points. Number the following statements in their proper sequence to describe the contra mechanism in a skeletal muscle cell Depolarization occurs, and the action potential is generated. The action potential, carried deep into the cell, causes the sarcoplasmic reticulum to release calcium ions The muscle cell relaxes and lengthens. Acetylcholine diffuses across the neuromuscular junction and binds to receptors on the sarcolemma. As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration at the myofilaments decreases Acetylcholine is released into the junction by the motor end plate The calcium ion concentration at the myofilaments increases; the myofilaments slide past one another, and the cell shortens. Part VI. 5 points. T-cells and B-cells exhibit certain similarities and differences. Put an Y in the appropriate spaces in the table below to indicate the lymphocyte type that exhibits each characteristic "msc 6 7
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