Which of the following is not a feature of neurons?
A. Contractility
B. Conductivity
C. Secretion
D. Excitability
E. Chromatophilic substance
Answer: A
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An excitatory postsynaptic potential (EPSP)
A) hyperpolarizes a neuron, decreasing the likelihood of an action potential. B) depolarizes a neuron, decreasing the likelihood of an action potential. C) hyperpolarizes a neuron, increasing the likelihood of an action potential. D) depolarizes a neuron, increasing the likelihood of an action potential.
Tetanus occurs when a muscle fiber is stimulated so rapidly that it is not allowed to relax between stimulations, resulting in a smooth, sustained contraction
Indicate whether the statement is true or false
Which of these does NOT influence the exchange of gases across the respiratory membrane?
A. the thickness of the membrane B. the total surface area of the membrane C. the rate at which each gas diffuses through the fluids D. the size of pores in the alveoli E. the concentration gradient for gases across the membrane
The fluid-mosaic model of the plasma membrane suggests that
A. phospholipids form a single lipid layer in the center of the membrane. B. proteins form a "liquid" sea in the membrane. C. cholesterol forms the outermost layer of the membrane. D. the membrane is neither rigid nor static in structure. E. proteins are not a part of the membrane.