Gans's and Northcutt's "new head" hypothesis proposes that
A) Vertebrates have a diffuse nerve sensory system.
B) More complex teeth in the head evolved in response to a more predatory lifestyle.
C) The success of vertebrates was linked to specializations of the head.
D) B and C
Answer: C
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During development, the left dorsal aorta and the common dorsal aorta form the descending aorta.
Answer the following statement true (T) or false (F)
What is the role of the Golgi apparatus in cellular metabolism?
What will be an ideal response?
Continuous conduction of action potentials means that
A. an action potential is conducted from one node of Ranvier to the next node. B. an action potential in one site generates local currents causing depolarization to threshold at the adjacent site. C. once an action potential is created, it moves in both directions along the axon. D. the whole axon depolarizes at the same time.
Propagation of an action potential down a myelinated axon requires that the action potential "jumps" from node to node in a process called ____ conduction.
Fill in the blank(s) with the appropriate word(s).