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The autonomic nervous system is divided into two divisions, 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 the sympathetic and parasympathetic system is said to be the dual innervation.
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- Figure 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_forwardcompare and contrast the differences between the sympathetic and parasympathetic nervous systems. Use the following scenarios: Scenario 1: You are walking outside late at night and you hear something in the bushes as you approach your home. Which system will dominate and what physiological changes will occur? Scenario 2: You have just finished a big dinner and now you are relaxing in your recliner to watch the big ball game. Which system will dominate and what physiological changes will occur? Be sure to at least include what happens to heart rate, blood pressure, and digestion. You may include other physiological variables as well. "Not a homework assignment"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
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- What does the sympathetic nervous system do? Give real life examples.arrow_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_forwardWhich of the following statements is true? Chemical messengers within cells are always the main determinant of the effector response. Dual innervation is always present in all organs and glands; one branch enhances the function or secretion, while the other branch inhibits it. The beating of the heart is regulated only by the sympathetic division. Some blood vessels contain alpha adrenergic receptors that cause vasoconstriction in the presence of epinephrine, whereas others have beta adrenergic receptors that cause vasodilation in the presence of epinephrine.arrow_forward
- A sympathetic response can be inhibited/blocked by which is correct? Muscarinic and nicotinic receptor antagonist Alpha and Beta receptor antagonist Alpha and muscarinic receptor antagonist Beta and nicotinic receptor antagonistarrow_forwardHow does the baroreceptor reflex raise blood pressure when blood pressure is too low? Stimulates the sympathetics and stimulates the parasympathetics Inhibits the sympathetics and inhibits the parasympathetics Stimulates the sympathetics and inhibits the parasympathetics Inhibits the sympathetics and stimulates the parasympahteticsarrow_forwardEssay on details of examples of the sympathetic and parasympathetic nervous systems and how they balance to bring about homeostasis?arrow_forward
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