Characteristic of smooth muscle

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Reference no: EM1389543

1. All of the following can occur during exercise except
A. Inorganic phosphate levels decrease
B. ATP levels decline
C. Oxygen levels decrease
D. Calcium levels decrease
2. Determine which unique characteristic of smooth muscle allows your stomach to streatch aas you eat and not contract immediatly to expel food?
A. Stress-relaxation response
B. Single Unit contraction
C. Slow contraction
D. Hyperplasia
3. The presynaptic neuron releases neurotransmitters in response to an influx of what ions?
A. Sodium
B. Potassium
C. Calcium
D. Sodium and Potassium
4.Prozac used for the treatment of depression exerts its effects by keeping the concentration of serotonin elevated in the synapse. These drugs exert their effects by?
A. Inhibiting reuptake of serotonin by presynaptic terminals
B. Inhibiting the enzyme that break down serotonin
C. Inhibiting diffusion of serotonin away from the synaptic cleft
D. All of the above
5. Which of the following is not true regarding graded potentials?
A. They generated by voltage-gated channels
B. They decrease in magnitude as they move away from the stimulus point
C. They are excitatory and inhibitory
D. They are typical postsynaptic potentials
6. -Blank- occurs when a neuron is stimulated at more than one dendride?
A. Temporal summation
B. Spatial summation
C. Synaptic delay
D. Synaptic potentiation
7. Which of the following is incorrect regarding G-protein linked receptors?
A. Their effects are slow and indirect
B.They activate second messengers such as calcium or cAMP to modulate ion channels
C. They are ligand-gated ion channels and their effects are brief
D. They include metabotropic glutamate and monoamine receptors
8. Which of the following does not bind to calcium to regulate muscle or neural activity?
A. Troponin
B. Calmodulin
C. Myosin
D. Synaptotagmin
9. Which of the following neuroglia regulates capillary permeability in the blood breain barrier?
A. Microglia
B. Ependymal cells
C. Astrocytes
D. Oligodendrocytes
10. All of the following statements are true regarding action potentials exept?
A. They need a threshold stimulus
B. Depolarization refers to a decrease in membrane potential
C. They travel more slowly on unmylinated fibers
D. Stronger stimuli generate higher amplitude of action potential

Reference no: EM1389543

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