Why is saltatory conduction faster than continuous conduction? What will be an ideal response?
Concepts to Consider: In continuous conduction, action potentials smoothly progress down an axon. Depolarization in one area causes adjacent voltage-gated ion channels to open,
sodium ions to flow in, etc. In saltatory conduction, axons are wrapped in myelin with only
nodes of Ranvier being exposed to extracellular fluid. Voltage-gated Na+ channels are mainly
clustered at nodes, so depolarization jumps from node to node down the axon.
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Match the following items with the correct phrases.
_______1. In addition to standard precautions, ____________________ must be used when managing a patient with streptococcal pneumonia. _______2. The goal of ____________________ is to render and keep objects and areas sterile. _______3. In addition to standard precautions, ____________________ must be used when managing a tuberculosis patient. _______4. The goal of ____________________ is to reduce the number and transmission of pathogens. _______5. In addition to standard precautions, ____________________ must be used when managing a Clostridium difficile–associated disease. a. airborne precautions b. contact precautions c. droplet precautions d. medical aseptic technique e. surgical aseptic technique
Which of the following statements about effector cells is FALSE?
a. They are fully differentiated lymphocytes. b. They can develop from either B cells or T cells. c. They secrete immunoglobulins or interleukins depending on their origin. d. Cytotoxic T cells are effector cells e. Helper T-cells are not effector cells.
Action potentials are propagated along a(n) ____
a. sodium channel b. axon in two directions c. gated channel d. axon in one direction e. dendrite
Which tends to be more intense: intraspecific or interspecific competition? Why?
What will be an ideal response?