Contrast chemically gated and voltage-gated channels. How do their functions differ? In which segments of a neuron are they found?
What will be an ideal response?
Chemically gated channels are generally receptors for a ligand, and they open when the ligand is present, while voltage-gated channels open in response to a change in charge. Chemically gated channels are found in receptive segments of a neuron (dendrites, soma), while voltage-gated channels are found in the initial, conductive and transmissive segments (hillock, axon, knob).
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Within a myofibril each myosin filament is surrounded by ________ actin filaments
Fill in the blank(s) with the appropriate word(s).
The epidermis does not contain blood vessels
a. true b. false
Label N represents which of the following structures?
A) nephron loop
B) renal corpuscle
C) proximal convoluted tubule
D) distal convoluted tubule
E) collecting duct
The middle ear communicates with the nasopharynx through the
A) auricle. B) membranous labyrinth. C) bony labyrinth. D) pharyngotympanic tube E) auditory meatus.