A certain drug decreases heart rate by producing hyperpolarization in the pacemaker cells of the heart....
A certain drug decreases heart rate by producing hyperpolarization in the pacemaker cells of the heart. This drug probably binds to.
a) muscarinic receptors.
b) beta receptors
c) alpha adrenergic receptors.
d) nicotinic receptors.
Homework Answers
a) muscarinic receptors
The muscarinic receptors binds to the drug thereby decreasing the heart rate of the person who consume it. By producing the hyperpolarization in the cells of the heart which can cause reduction in the rate of heart.
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A certain drug decreases heart rate by producing
hyperpolarization in the pacemaker cells of the heart....
The autonomic nervous system can change the rate of the heart by: (could have multiple correct...
The autonomic nervous system can change the rate of the heart by: (could have multiple correct answers) a) beta1 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells. This increases the frequency of APs of the pacemaker, and increases the rate of contraction. b) beta2 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the...
The autonomic nervous system can change the rate of the heart by: (could have multiple correct...
The autonomic nervous system can change the rate of the heart by: (could have multiple correct answers) a) beta1 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells. This increases the frequency of APs of the pacemaker, and increases the rate of contraction. b) beta2 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the...
Assuming that you had an agonist and an antagonist for every autonomic transmitter receptor, how could...
Assuming that you had an agonist and an antagonist for every autonomic transmitter receptor, how could you determine which receptor types exist in any autonomically controlled effector? Using the method you defined in Question 1 and your knowledge of the Autonomic control of the function of the internal organs, predict the effects (increase, decrease, or no change) of the following autonomic agonists on heart rate (HR). AGONIST HR CHANGE alpha-adrenergic beta-adrenergic muscarinic nicotinic Using autonomic pharmacological agents, how could you...
You can BLOCK the DECREASE in heart rate following parasympathetic nervous system activation with an intravenous...
You can BLOCK the DECREASE in heart rate following parasympathetic nervous system activation with an intravenous injection of a) a nicotinic acetylcholine receptor antagonist b) a muscarinic acetylcholine receptor antagonist c) an adrenergic receptor antagonist d) either A or B e) either A or C I think the answer is d or e
16. Which of the following explains the action of Epinephrine at the SA node? a) It...
16. Which of the following explains the action of Epinephrine at the SA node? a) It binds to Beta 1 receptors on the SA node increasing the strength of cardiac muscle contraction b) It binds to muscarinic receptors on the SA node prolonging repolarization c) It binds to beta 1 receptors on the SA node causing rapid opening of HCN causing the membrane increasing the frequency of action potentials 17. Which of the following describes the action of a cholinergic...
Please answer ALL questions. 1. Select the correct combination for a sympathetic increase in heart rate...
Please answer ALL questions. 1. Select the correct combination for a sympathetic increase in heart rate A. acetylcholine -- alpha receptors -- increased potassium permeability B. norepinephrine and epinephrine -- beta 2 receptors --increased permeability to sodium, potassium, and calcium C. acetylcholine --muscarinic receptors --increased potassium permability D. norepinephrine and epinephrine -- nicotinic receptors --increased permeability to calcium E. norepinephrine and epinephrine -- beta 1 receptors -- increased permeability to sodium and calcium 2. If there is loss of plasma...
11. Acetylcholine is both an excitatory and inhibitory ligand depending on the location of its receptor....
11. Acetylcholine is both an excitatory and inhibitory ligand depending on the location of its receptor. What does Acetylcholine do that makes it "excitatory"? a. It causes a cell membrane to depolarize and produce Excitatory Post Synaptic Potentials b. It opens K+ ion channels when it binds to its receptors c. It causes a cell membrane to hyperpolarize 12. The bonding of Acetylcholine to its muscarinic receptors on smooth muscle causes gated K+ channels to close. This action is described...
70) The chromafin cells of the adrenal medulla possess what type of receptor that makes them...
70) The chromafin cells of the adrenal medulla possess what type of receptor that makes them responsive to the ACh released by preganglionic sympathetic neurons? a) muscarinic receptors b) nicotinic receptors c) B1-adrenergic d) 2-adrenergic e) B3-adrenergic 71) Which of the following statements describes a common response of an autonomic effector during the "fight-or-flight" response? a) Gastric motility and secretory activity increases. b) Blood vessels serving skeletal muscles constrict. c) Adipose tissues store away triglycerides for later use. d) The...
41. A nurse is reviewing the structure and function of the neurologic system in preparation for...
41. A nurse is reviewing the structure and function of the neurologic system in preparation for a work placement on a neurologic unit? What statement most accurately describes an aspect of the autonomic nervous system? A) The autonomic nervous spans the central and peripheral nervous systems B) Cholinergic receptors are exclusively located in the sympathetic nervous system C) Nicotinic receptors are primarily associated with the parasympathetic nervous system. D) Alpha- and beta-receptors are the two basic types of muscarinic receptors...
5.5.30. A drug is suspected of causing an elevated heart rate in a certain group of...
5.5.30. A drug is suspected of causing an elevated heart rate in a certain group of high-risk patients. Twenty patients from the group were given the drug. The changes in heart rates were found to be as follows 1 8 5 10 2 12 7 913 4 6 4 12 1 2- 10 2 8 Construct a 98% confidence interval for the mean change in heart rate. Assume that the population has a normal distribution. Interpret your answer
70) The chromafin cells of the adrenal medulla possess what type of receptor that makes them responsive to the ACh released by preganglionic sympathetic neurons? a) muscarinic receptors b) nicotinic receptors c) B1-adrenergic d) 2-adrenergic e) B3-adrenergic 71) Which of the following statements describes a common response of an autonomic effector during the "fight-or-flight" response? a) Gastric motility and secretory activity increases. b) Blood vessels serving skeletal muscles constrict. c) Adipose tissues store away triglycerides for later use. d) The...
41. A nurse is reviewing the structure and function of the neurologic system in preparation for a work placement on a neurologic unit? What statement most accurately describes an aspect of the autonomic nervous system? A) The autonomic nervous spans the central and peripheral nervous systems B) Cholinergic receptors are exclusively located in the sympathetic nervous system C) Nicotinic receptors are primarily associated with the parasympathetic nervous system. D) Alpha- and beta-receptors are the two basic types of muscarinic receptors...
5.5.30. A drug is suspected of causing an elevated heart rate in a certain group of high-risk patients. Twenty patients from the group were given the drug. The changes in heart rates were found to be as follows 1 8 5 10 2 12 7 913 4 6 4 12 1 2- 10 2 8 Construct a 98% confidence interval for the mean change in heart rate. Assume that the population has a normal distribution. Interpret your answer
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