An action potential is self-propagating and does not weaken with distance. How is the action potential self-propagating?
What will be an ideal response?
The action potential travels along an axon, affecting each patch of membrane only briefly. When voltage-gated sodium channels open, some of the sodium ions that rush inward diffuse into adjacent regions of cytoplasm. The arrival of positive ions raises the membrane potential in these regions to threshold level, setting in motion an action potential in adjacent patches of membrane. Sodium channels open in one region of membrane after another, and the action potential moves along the axon from trigger zone to terminals.
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a. produced by mitosis within the sporangium. b. diploid cells. c. the first cells of the gametophyte generation. d. both a and b.
The symplast is the continuum of living cytoplasm. Indicate whether the statement is true or false
Aerobic respiration and fermentation ________.
A. evolved in different living organisms to utilize energy stored in glucose with equal efficiency B. occur only in animal cells because plants carry out photosynthesis C. utilize fat as primary energy source D. occur at the same rate throughout all cells of the body E. start with glycolysis.
Which of the following cell groups is responsible for all components of DiGeorge Syndrome?
A. Ectoderm B. Endoderm C. Mesenchyme D. Neural Crest Cells E. Pharyngeal Arch I Cells