In a crayfish, the receptor potential of a stretch receptor O a. spreads when ion channels in the cell's dendrites are opened. O b. decreases when the muscle is stretched. O c. starts at the axon hillock. O d. can be transmitted to the central nervous system. e. is created by the opening of ion channels in the axon.

which of the following is NOT a step in rod phototransduction by rhodopsin? activation of rhodopsin by photons conversion of cGMP to GMP by phosphodiesterase opening of cGMP-dependent ion channels and hyperpolarization of the membrane activation of phosphodiesterase by light-activated rhodopsin through Galphat, (couldn't add the alpha into that part    i didn't select an answer resulting in getting it wrong and wish to know what the correct answer is and how it is the correct answer

Rods and cones differ in how they connect to bipolar cells and eventually to ganglion cells. The major difference is that many cones converge onto one ganglion cell many cones converge onto one bipolar cell many rods converge onto one bipolar cell one rod reaches one bipolar cell

Which treatment would eliminate the early inward current in a squid giant axon? O Applying a calcium channel blocker Removal of external potassium Removal of external sodium O Applying a potassium channel blocker

Which of the following provides the most accurate example of active sensing being used by an animal? Male moths use paired antenna to track the pheronome trail of a female moth Electric fish detect the electric field of other nearby electric fish Cats have a tapetum that enhances their night vision for hunting prey in the dark Bats use echolocation to hunt flying insects at night

In paralytic shellfish poisoning, the dinoflagellates involved produce a type of neurotoxin.  What does the neurotoxin do to action potentials?