CAMPBELL BIOLOGY IN FOCUS (LL)-W/MOD.MA
3rd Edition
ISBN: 9780135686065
Author: Urry
Publisher: PEARSON
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Chapter 37, Problem 13TYU
SYNTHESIZE YOUR KNOWLEDGE
The rattlesnake alerts enemies to its presence with a rattle—a set of modified scales at the tip of its tail. Describe the distinct roles of gated ion channels in initiating and moving a signal along the nerve from the snake’s head to its tail and then from that nerve to the muscle that shakes the rattle.
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Create at least 6 analogies comparing (3) and contrasting (3) the processes involve in chemical and nervous control in plant animals.
Example:
Photoreceptor (Animal): Phototropism (Plants) (Both involved responding to light stimulus)
EVOLUTION CONNECTION An action potential is an all-ornone event. This on/off signaling is an evolutionary adaptationof animals that must sense and act in a complex environment.It is possible to imagine a nervous system in which the actionpotentials are graded, with the amplitude depending on thesize of the stimulus. Describe what evolutionary advantage on/off signaling might have over a graded (continuously variable)kind of signaling.
The giant squid axon has a diameter = 1mm and 1 = 13mm. Compared to a mammalian neuron with a diameter = 1 um and ^ = 0.2mm, which of the following is correct?
graded potentials can generate action potentials in the mammalian axon but not in the squid axon.
graded potential of similar magnitude would result in action potentials with larger amplitude in the mammalian axon
graded potentials of similar magnitude would result in action potentials with larger amplitude in the squid axon
graded potentials of similar magnitude would travel furthest from their point of origin in the mammalian axon
graded potentials of similar magnitude would travel furthest from their point of origin in the squid axon
Chapter 37 Solutions
CAMPBELL BIOLOGY IN FOCUS (LL)-W/MOD.MA
Ch. 37.1 - Prob. 1CCCh. 37.1 - Describe the basic pathway of information flow...Ch. 37.1 - WHAT IF? How might increased branching of an axon...Ch. 37.2 - Under what circumstances could ions flow through...Ch. 37.2 - WHAT IF? Suppose a cells membrane potential shifts...Ch. 37.2 - Prob. 3CCCh. 37.3 - How do action potentials and graded potentials...Ch. 37.3 - In multiple sclerosis (from the Greek skleros,...Ch. 37.3 - Prob. 3CCCh. 37.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 37.4 - Prob. 1CCCh. 37.4 - Organophosphate pesticides work by inhibiting...Ch. 37.4 - MAKE CONNECTIONS Name one or more membrane...Ch. 37 - What happens when a resting neuron's membrane...Ch. 37 - Prob. 2TYUCh. 37 - Prob. 3TYUCh. 37 - Why are action potentials usually conducted in one...Ch. 37 - Which of the following is a direct result of...Ch. 37 - Suppose a particular neurotransmitter causes an...Ch. 37 - Prob. 7TYUCh. 37 - Prob. 8TYUCh. 37 - DRAW IT Suppose a researcher inserts a pair of...Ch. 37 - Prob. 10TYUCh. 37 - FOCUS ON EVOLUTION An action potential is an...Ch. 37 - Prob. 12TYUCh. 37 - SYNTHESIZE YOUR KNOWLEDGE The rattlesnake alerts...
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