BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
Author: BROOKER
Publisher: MCG
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Chapter 42.4, Problem 3EQ
Summary Introduction
To determine: An experiment to test the hypothesis that acetylcholine is Loewi’s proposed vaghusstoff, using a heart (without its vagus nerve), some acetylcholine, and an acetylcholine receptor blocker.
Introduction: Otto Loewi, a German physiologist, through his experiments, showed that there is some non-electrical entity that is released into the surrounding of the electrically excited heart that results in the desired action on the heart muscles. Experimental studies by Loewi opened the doors for chemical neurotransmitter studies.
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parasympathetic nervous system ,True or False
Postganglionary neurons can stimulate the heart[ Select ]Preganglionary nerve fibers originate from the brain stem or from the sacral part of the spinal cord SantPreganglionary fibers are relatively long[ Select ]Preganglionary neuron emits acetylcholine[ Select ]Postganglionary neurons can stimulate skeletal muscle[ Select ]Postganglionary Neuron Emits Acetylcholine False
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lon channels
Greater response to norepinephrine
than epinephrine
Found at target organ in
parasympathetic pathways
Can inhibit cell activity
Activate CAMP
Greater response to epinephrine than
norepinephrine
Found in sympathetic and
parasympathetic pathways
Affect enzyme activity
Alpha receptors
Beta receptors
Nicotinic receptors
Muscarinic receptors
What do you think is the muscarinic receptor subtype that has a greater role in generating contractions in human detrusor smooth muscle (M2 or M3)? Propose further experiments that would support your answer.
Chapter 42 Solutions
BIOLOGY (LL)
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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