Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to
signal contraction by the muscle cell.
B. A cell-surface receptor on the muscle cell
is activated by acetylcholine binding.
C. Upon activation, the acetylcholine receptor
on the neuron undergoes a conformational
change to activate an ion channel in the
muscle cell.
D. An opened ligand-gated ion channel
allows sodium ions to rush across the plasma
membrane to the inside of the muscle cell.
E. A sudden influx of sodium ions across the
plasma membrane drastically reduces the
membrane potential and activates the
contractile machinery of the muscle cell.
C
You might also like to view...
A population of mountain goats are split because of the formation of a glacier. After 50 years the glacier melts and the population reunites. Hybrid zones may occur if
A. both pre-mating and post-mating isolating mechanisms occur. B. reproductive isolation is incomplete. C. a geographic barrier is removed after reproductive isolation is complete. D. both pre-mating and post-mating isolating mechanism occur and reproductive isolation is complete. E. both pre-mating and post-mating isolating mechanisms occur and a geographic barrier is removed after reproductive isolation is complete are correct.
The membrane component(s) primarily responsible for the structure and function of plasma membranes is/are
A. glycosylated proteins. B. phospholipids. C. glycolipids. D. nucleic acids. E. cholesterol.
The perception of a certain pitch of sound depends partly on
A. which bones of the middle ear are moved. B. the amplitude of the sound waves. C. whether it is the round window or oval window that vibrates. D. which hair cells of the cochlea are stimulated. E. where particles settle in the semicircular canals.
Which digestive structure stores concentrated bile?
a. the gallbladder b. the stomach c. the pancreas d. the duodenum