The following are the steps involved in transmission at a cholinergic synapse. What is the correct sequence for these events? 1. Chemically-gated sodium channels on the postsynaptic membrane are activated. 2. Calcium ions enter the synaptic terminal. 3. Acetylcholinesterase hydrolyzes acetylcholine. 4. An action potential depolarizes the synaptic terminal at the presynaptic membrane. 5. The
pre-synaptic terminal reabsorbs choline. 6. Acetylcholine is released from storage vesicles by exocytosis. 7. Acetylcholine binds to receptors on the postsynaptic membrane. 8. Calcium ions are removed from the cytoplasm of the pre- synaptic terminal.
A) 4, 2, 6, 7, 8, 5, 3, 1
B) 4, 2, 6, 7, 1, 8, 3, 5
C) 2, 4, 6, 7, 1, 8, 3, 5
D) 2, 5, 4, 6, 7, 1, 8, 3
E) 6, 4, 2, 7, 1, 8, 3, 5
B
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When an acid and a base are combined, they form a salt and water. This type of reaction is called a(n) _____.?
A) ?negatively charged hydroxide ion B) ?neutralization C) ?ionization
At the normal resting membrane potential of a typical neuron, its sodium-potassium exchange pump transports
A) 1 intracellular sodium ion for 2 extracellular potassium ions. B) 2 intracellular sodium ions for 1 extracellular potassium ion. C) 3 intracellular sodium ions for 1 extracellular potassium ion. D) 3 intracellular sodium ions for 2 extracellular potassium ions. E) 3 extracellular sodium ions for 2 intracellular potassium ions.
What part of the body does the gastrocnemius move?
a. head and neck b. upper extremities c. trunk of the body d. lower extremities
Label G represents which structure?
A) circular fold
B) submucosa
C) muscularis externa
D) serosa
E) mucosa