Organs contain two or more tissues that work together to perform specific, complex functions.
Answer the following statement true (T) or false (F)
True
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Which elements of the cytoskeleton help maintain the shape of the cells, move organelles around, and aid in cell division?
A. Cilia B. Intermediate fibers C. Actin filaments D. Microtubules
The fuzzy coat of carbohydrates on the outer surface of the plasma membrane that functions in cell identification is called the __________.
A. brush border B. glycocalyx C. cholesterol coat D. phospholipid bilayer E. cell-adhesion molecule
In a graded potential, the direction of current flow is designated by the movement of positive charges
Indicate whether the statement is true or false
Since the action potential "leaps" from node to node in a myelinated axon, ________.
A. action potentials move faster if the nodes are farther apart B. Na+ movement within the myelin sheath is possible C. Na+ channels are not present between the nodes D. myelinated axons need far less Na+ channels than unmyelinated axons