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SCI221
Study Stack 1
| Question | Answer |
|---|---|
| Oxytocin operated as a negative-feedback loop, what effect would it have on uterine contractions? Oxytocin would stimulate stronger uterine contractions. Oxytocin would inhibit uterine contractions. | Oxytocin would inhibit uterine contractions. |
| Diffusion of particles through a membrane by means of a carrier molecule is called: pinocytosis. osmosis. facilitated diffusion. dialysis. | facilitated diffusion. |
| During which phase of the twitch contraction is there a triggering of the release of calcium ions into the sarcoplasm? Latent period Contraction phase Relaxation phase None of the above | Latent period |
| The mechanisms that produce and maintain the resting membrane potential do so by producing a slight excess of negative ions on the outer surface of the plasma membrane. slight excess of positive ions on the outer surface of the plasma membrane. | slight excess of positive ions on the outer surface of the plasma membrane. |
| The tiny bulge at the end of a terminal branch of a presynaptic neuron’s axon is called a(n) synaptic knob. synaptic cleft. telondendria. receptor site. | synaptic knob. |
| A membrane that exhibits a membrane potential is said to be unipolarized. multipolarized. bipolarized. polarized. | polarized. |
| There are two types of synapses—the electrical synapse and the __________ synapse. chemical mechanical sensory sonic | chemical |
| Severe depression can be caused by a deficit in certain brain synapses of: acetylcholine. amines. amino acids. neuropeptides. | amines. |
| Which is true of a neuron with a resting potential? The cell membrane is permeable to Na+ but impermeable to K+ ions. The sodium pump has moved Na+ to the outside of the plasma membrane. | The sodium pump has moved Na+ to the outside of the plasma membrane. |
| Which neuron could transmit a nerve impulse the fastest? A small-diameter neuron without myelin A large-diameter neuron without myelin A large-diameter neuron with myelin A small-diameter neuron with myelin | A large-diameter neuron with myelin |