Describe the events that occur at a skeletal neuromuscular junction. Include the following in your answer : action potential (on axon and muscle fiber), end-plate potential, terminal button, ACh, Ca+2 channels, motor end plate, depolarization, and Na+ channels
What will be an ideal response?
When an action potential reaches the terminal button on the axon, voltage-gated Ca2+ channels open, allowing Ca2+ ions to enter the button. This causes the release of ACh, which binds to Na+ channels on the muscle cell's membrane (called the motor end plate). These channels open and allow Na+ ions to enter the muscle cell, causing depolarization; this is called the end-plate potential. This depolarization causes nearby voltage-gated Na+ channels to open and initiate action potentials on the muscle cell.
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A) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle B) threshold is reached more quickly and heart rate would increase C) potassium channels compensate and no change in heart rate would occur D) heart rate would decrease, but blood pressure would rise due to the excess sodium present
A cat's tissue ____________ can be accessed with its capillary refill time
Fill in the blank(s) with correct word
The amount of Na+ excreted depends on the amount of Na+ ____________________ minus the amount of Na+ ____________________
Fill in the blank(s) with correct word
Which of the following levels of organization is inclusive of all others?
A) chemical level B) tissue level C) organ level D) organ system level E) cellular level