Diapedesis is the means by which a leukocyte reproduces
Indicate whether the statement is true or false
F
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Action potentials are able to travel over long distances without decaying because
A) The axons are perfectly insulated, so no current is able to leak out. B) The action potential uses completely different ions than graded potentials. C) Once the electrical signal has passed threshold, it is impossible for the signal to decay. D) One action potential generates the next one in an adjacent area of membrane.
Which of the following statements concerning receptors is correct?
a. the larger the receptor potential, the greater the frequency of action potentials initiated in the afferent neuron. b. tonic receptors often exhibit an "off-response." c. phasic receptors are important in situations where maintained information about a stimulus is valuable. d. receptor adaptation results from nerve fatigue. e. receptors are part of efferent neurons.
Compliance refers specifically to the
a. effort required to stretch the lungs. b. elasticity of the lung tissue. c. energy requirements for an inspiration. d. surface area of the alveoli. e. volume of air moved per breathing cycle.
All of the following are proper guidelines for using a microscope EXCEPT which statement?
A) Use one hand to carry the microscope. B) Use only special lens paper to clean the lenses of the microscope. C) Unplug the microscope by pulling on the plug, not by tugging on the electrical cord. D) Use only cleaning solution provided by your laboratory instructor to clean the microscope lenses.