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The autonomic nervous system comprises of sympathetic and parasympathetic divisions. Both these systems innervate the visceral organs and have their own effects on the target organs. The sympathetic system operates in the heart, lungs, and smooth muscles and it executes its effect on flight or fight response to create organs excitation. On the contrary, the parasympathetic system innervates the same organ and it effects executes during rest or digest mode. The innervation of an organ by sympathetic and parasympathetic system is said to be the dual innervation. In some cases, the autonomic nervous system does not need the dual innervation. There are some cases of organs, where there is no need of dual innervation.
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ANATOMY & PHYSIOLOGY: THE UNITY OF FORM
- Compare the primary mechanisms used by the sympathetic and parasympathetic divisions to clear or remove neurotransmitters? In other words, how do they terminate their neurotransmitter activity? How do they differ from each other? Question #2 Barbra Streisand, age 79, has asthma. We are considering an adrenergic drug for treatment. For Ms. Streisand, what are the drug advantages and diadvantages associciated with the use of ephedrine isoproterenol metaproterenol albuterol terbutaline Would her age be a factor in selecting the best drug? Explain. Question #3 Steven Seagal, age 69, has hypertension and asthma. We are considering treating him with an adrenergic blocker. What are the advantages and disadvantages for each of the drugs below to treat high blood pressure? doxazosin prazosin propranolol metoprolol atenolol acebutolol What needs to be included when teaching individuals suffering from high blood pressure about the use of an adrenergic blocker?arrow_forwardWhat are the receptor types and neurotransmitters in the three systems?arrow_forwardWhich of the following is correct about the sympathetic division of the autonomic nervous system? Select one: O A. the neurotransmitter released by postganglionic neurons is norepinephrine O B. the neurotransmitter released by postganglionic neurons is acetylcholine O C. sympathetic nerves form synapses in ganglia near or within an internal organ O D. sympathetic nerves exit the central nervous system at the base of the brain and the sacral region of the spinal cord O E. sympathetic nerves typically exit the central nervous system and form ganglia located just outside the brainarrow_forward
- Which of the following is an example of antagonistic control? O The parasympathetic nervous system originates from the brain stem and pelvic nerves, while the sympathetic arises from the thoracic and lumbar spinal cord. O Sympathetic stimulation causes renin secretion by the kidneys, but the kidneys are not innervated by the parasympathetic nervous system. O Parasympathetic stimulation causes bronchoconstriction, while sympathetic stimulation causes bronchodilation. O The vagus nerve innervates much of the viscera, changing the function of each of them independently of the others.arrow_forwarda channel can be gated mechanically, voltage or by a ligand. When you hear a sound all three of these type channels are being utilized. Explain generally where/how each of these channels are being utilized starting from hearing the sound, through travelling down a nerve to transmission to another nerve.arrow_forwardUsing the cardiovascular, respiratory and digestive systems as examples, explain how dual innervation regulates the function of each system.arrow_forward
- For which of the following systems is the neurotransmitter acetylcholine released by neurons at the target tissue? true only for the sympathetic division true only for the parasympathetic division true for both divisions false for both divisionsarrow_forwardWhich of the following is correct about the sympathetic division of the autonomic nervous system? Select one: O A. sympathetic nerves exit the central nervous stem at the base of the brain and the sacral region of the spinal cord O B. the neurotransmitter released by postganglionic neurons is acetylcholine O C. the neurotransmitter released by postganglionic neurons is norepinephrine O D. sympathetic nerves form synapses in ganglia near or within an internal organ O E. sympathetic nerves typically exit the central nervous system and form ganglia located just outside the brainarrow_forwardMatch the following statements about anatomy to the correct division of the autonomic nervous system. Select "Both" if the statement or effect is true of both divisions. Innervate(s) most major organs of the body. Innervate(s) most blood vessels. Most effector pathways involve two neurons. The vagus cranial nerve carries these fibers. ANSWER OPTIONS: Parasympathetic, Sympathetic, BOTHarrow_forward
- In the sympathetic division of the autonomic nervous system: Select one: The ratio between the number of postganglionic and preganglionic neurons is small. A single preganglionic neuron usually synapses with a single postganglionic neuron. An important functional characteristic is convergence of the preganglionic fibers. Preganglionic fibers are usually much longer than the postganglionic fibers. Activity of the neurons tends to have a more generalized and widespread effect on the body.arrow_forwardWhy are many drugs that are used to treat nervous system diseases or to affect brain function targeted to specific receptors rather than particular neurotransmitters?arrow_forwardFigure 35.26 Which of the following statements is false? The parasympathetic pathway is responsible for relaxing the body, while the sympathetic pathway is responsible for preparing for an emergency. Most preganglionic neurons in the sympathetic pathway originate in the spinal cord. Slowing of the heartbeat is a parasympathetic response. Parasympathetic neurons are responsible for releasing norepinephrine on the target organ, while sympathetic neurons are responsible for releasing acetylcholine.arrow_forward
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