Which of the following cell organelles does not contain microtubules?
A. cilia
B. flagella
C. spindle fibers
D. centrioles
E. All of these choices contain microtubules.
E
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Explain what dynamic equilibrium is and how it affects homeostasis
________ peritoneum covers the external surfaces of most digestive organs.
Fill in the blank(s) with the appropriate word(s).
Identify structure "D" on the neuron.
A. Schwann cell B. Axon C. Dendrites D. Neuron cell body (soma) E. Node of Ranvier
Which is most directly responsible for the falling (repolarizing) phase of the action potential?
A. The permeability to Na+ increases greatly. B. The Na+, K+ pump restores the ions to their original locations inside and outside of the cell. C. ATPase destroys the energy supply that was maintaining the action potential at its peak. D. Voltage-gated Na+ channels are opened. E. The permeability to K+ increases greatly while that to Na+ decreases.