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A long bone is covered externally with a sheath called the __________, whereas the marrow cavity is lined with the __________. 

A long bone is covered externally with a sheath called the __________, whereas the marrow cavity is lined with the __________. 

18) Which pH is closest to normal body pH? 

3) Which of the following is arranged in correct order from the most complex to the simplest?

The following is a list of the events that occur during a muscle contraction. Myosin heads bind to the actin The free myosin head splits ATP Calcium ions are released from the sarcoplasmic reticulum The myosin head pivots toward the center of the sarcomere Calcium ions bind to troponin The myosin heads bind an ATP molecule and detach from the actin   The proper sequence of these events is:

The following is a list of the events that occur during a muscle contraction. Myosin heads bind to the actin The free myosin head splits ATP Calcium ions are released from the sarcoplasmic reticulum The myosin head pivots toward the center of the sarcomere Calcium ions bind to troponin The myosin heads bind an ATP molecule and detach from the actin   The proper sequence of these events is:

66. Spinal nerves are

The following are the main steps in the generation of an action potential. Sodium channels are inactivated. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. Sodium channels regain their normal properties. A graded depolarization brings an area of an excitable membrane to threshold. A temporary hyperpolarization occurs. Sodium channel activation occurs. Sodium ions enter the cell and depolarization occurs.   The proper sequence of these events is :

The following are the main steps in the generation of an action potential. Sodium channels are inactivated. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. Sodium channels regain their normal properties. A graded depolarization brings an area of an excitable membrane to threshold. A temporary hyperpolarization occurs. Sodium channel activation occurs. Sodium ions enter the cell and depolarization occurs.   The proper sequence of these events is :

71. The third and fourth ventricles are linked by a slender canal designated as the