Fill in the blanks to match the appropriate phrases.
words
k+ permeability
membrane potential of -90 and mv
membrane potential of -70mv
na+ permeability
phrases
1. the resting membrane potential of the cell.
2. the point at which there is no net movement of k+ into or out of the cell.
3. although it plays a role, it is not a primary determinant of the resting membrane potential.
4. the primary determinant of the resting membrane potential.

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).