Podcast
Questions and Answers
The autonomic nervous system is subject to voluntary control.
The autonomic nervous system is subject to voluntary control.
False
Preganglionic fibers release neurotransmitter onto effector organs in the autonomic nervous system pathway.
Preganglionic fibers release neurotransmitter onto effector organs in the autonomic nervous system pathway.
False
Acetylcholine can bind to nicotinic receptors in the autonomic nervous system.
Acetylcholine can bind to nicotinic receptors in the autonomic nervous system.
True
Adrenergic fibers release acetylcholine.
Adrenergic fibers release acetylcholine.
Signup and view all the answers
Most visceral (internal) organs are innervated by both sympathetic and parasympathetic nerve fibers.
Most visceral (internal) organs are innervated by both sympathetic and parasympathetic nerve fibers.
Signup and view all the answers
Motor neurons innervate skeletal muscle and trigger voluntary movement.
Motor neurons innervate skeletal muscle and trigger voluntary movement.
Signup and view all the answers
The somatic nervous system originates in the lateral horn of the thoracic spinal cord.
The somatic nervous system originates in the lateral horn of the thoracic spinal cord.
Signup and view all the answers
The somatic nervous system can both stimulate and inhibit effector organs.
The somatic nervous system can both stimulate and inhibit effector organs.
Signup and view all the answers
Afferent neurons terminate at interneurons.
Afferent neurons terminate at interneurons.
Signup and view all the answers
Efferent neurons carry instructions from the CNS to the effector organs.
Efferent neurons carry instructions from the CNS to the effector organs.
Signup and view all the answers
A neuromuscular junction is a link between two motor neurons.
A neuromuscular junction is a link between two motor neurons.
Signup and view all the answers
The neurotransmitter released at the neuromuscular junction is acetylcholine (ACh).
The neurotransmitter released at the neuromuscular junction is acetylcholine (ACh).
Signup and view all the answers
Acetylcholinesterase (AChE) is an enzyme that keeps the muscle cell's electrical response turned on.
Acetylcholinesterase (AChE) is an enzyme that keeps the muscle cell's electrical response turned on.
Signup and view all the answers
Botulinum toxin acts by triggering explosive release of ACh from storage vesicles at all cholinergic sites.
Botulinum toxin acts by triggering explosive release of ACh from storage vesicles at all cholinergic sites.
Signup and view all the answers
Organophosphates (example: sarin gas) irreversibly block acetylcholinesterase (AChE), resulting in respiratory failure.
Organophosphates (example: sarin gas) irreversibly block acetylcholinesterase (AChE), resulting in respiratory failure.
Signup and view all the answers
__________nerve fibers originate in the thoracic and lumbar regions of the spinal cord.
__________nerve fibers originate in the thoracic and lumbar regions of the spinal cord.
Signup and view all the answers
____________ postganglionic fibers are short, terminating on the effector organs.
____________ postganglionic fibers are short, terminating on the effector organs.
Signup and view all the answers
Most visceral organs are innervated by _______________ nerve fibers.
Most visceral organs are innervated by _______________ nerve fibers.
Signup and view all the answers
__________ dominance is concerned with general 'housekeeping' activities.
__________ dominance is concerned with general 'housekeeping' activities.
Signup and view all the answers
__________ dominance promotes the 'fight or flight' response.
__________ dominance promotes the 'fight or flight' response.
Signup and view all the answers
Smooth muscle cells are innervated by ___________.
Smooth muscle cells are innervated by ___________.
Signup and view all the answers
_______________ receptors respond to acetylcholine released from both sympathetic and parasympathetic preganglionic fibers.
_______________ receptors respond to acetylcholine released from both sympathetic and parasympathetic preganglionic fibers.
Signup and view all the answers
A(n) ________ binds with the receptor and prevents the neurotransmitter from causing a response.
A(n) ________ binds with the receptor and prevents the neurotransmitter from causing a response.
Signup and view all the answers
The sympathetic nervous system is part of the __________ nervous system.
The sympathetic nervous system is part of the __________ nervous system.
Signup and view all the answers
The __________ nervous system promotes responses that prepare the body for strenuous physical activity.
The __________ nervous system promotes responses that prepare the body for strenuous physical activity.
Signup and view all the answers
The ____________ nervous system dominates in quiet, relaxed situations.
The ____________ nervous system dominates in quiet, relaxed situations.
Signup and view all the answers
________ system promotes 'rest and digest' bodily functions.
________ system promotes 'rest and digest' bodily functions.
Signup and view all the answers
_____________ receptors are found on the cell membrane of cardiac muscle, smooth muscle and glands.
_____________ receptors are found on the cell membrane of cardiac muscle, smooth muscle and glands.
Signup and view all the answers
The __________ division of the autonomic nervous system stimulates contraction of the bladder wall.
The __________ division of the autonomic nervous system stimulates contraction of the bladder wall.
Signup and view all the answers
Stimulation of the _________ division of the autonomic nervous system causes an increased heart rate.
Stimulation of the _________ division of the autonomic nervous system causes an increased heart rate.
Signup and view all the answers
The parasympathetic and sympathetic nerve fibers innervate most visceral organs, a phenomenon called __________.
The parasympathetic and sympathetic nerve fibers innervate most visceral organs, a phenomenon called __________.
Signup and view all the answers
A(n) _________ binds with the receptor and causes the same response as the neurotransmitter would.
A(n) _________ binds with the receptor and causes the same response as the neurotransmitter would.
Signup and view all the answers
Which of the following receptors respond to acetylcholine released from both sympathetic and parasympathetic preganglionic fibers?
Which of the following receptors respond to acetylcholine released from both sympathetic and parasympathetic preganglionic fibers?
Signup and view all the answers
Which nervous system promotes the 'rest and digest' bodily functions?
Which nervous system promotes the 'rest and digest' bodily functions?
Signup and view all the answers
Which division of the autonomic nervous system stimulates contraction of the bladder wall?
Which division of the autonomic nervous system stimulates contraction of the bladder wall?
Signup and view all the answers
Which receptors are found on the cell membrane of cardiac muscle, smooth muscle, and glands?
Which receptors are found on the cell membrane of cardiac muscle, smooth muscle, and glands?
Signup and view all the answers
Study Notes
Autonomic Nervous System (ANS)
- ANS is not subject to voluntary control.
- Preganglionic fibers do not directly release neurotransmitters onto effector organs.
- Acetylcholine binds to nicotinic receptors within the ANS.
- Adrenergic fibers release norepinephrine, not acetylcholine.
Nervous System Divisions
- Most visceral organs receive innervation from both sympathetic and parasympathetic fibers.
- The sympathetic nervous system is responsible for the "fight or flight" response.
- Parasympathetic dominance facilitates “housekeeping” activities and “rest and digest” functions.
Neuronal Structures
- Motor neurons provoke voluntary movement in skeletal muscles.
- Somatic nervous system does not originate in the lateral horn of the thoracic spinal cord.
- Afferent neurons terminate at interneurons, while efferent neurons carry instructions from the CNS to effector organs.
Neuromuscular Junctions
- A neuromuscular junction is not a link between motor neurons but the connection between a motor neuron and skeletal muscle.
- Acetylcholine is released at the neuromuscular junction to stimulate muscle contraction.
- Acetylcholinesterase (AChE) serves to terminate the action of acetylcholine, not to keep it turned on.
Toxins and Enzymes
- Botulinum toxin does not trigger the release of ACh; it inhibits its release.
- Organophosphates irreversibly block AChE, leading to respiratory failure.
Nerve Fibers
- Sympathetic nerve fibers originate in thoracic and lumbar spinal cord regions.
- Parasympathetic postganglionic fibers are short and terminate on effector organs.
- Smooth muscle cells are innervated by sympathetic fibers.
Receptors and Responses
- Nicotinic receptors respond to acetylcholine from both ANS divisions.
- Antagonists prevent neurotransmitter effects; agonists mimic neurotransmitter actions.
- Muscarinic receptors are located on cardiac muscle, smooth muscle, and glands.
Autonomic Functions
- The parasympathetic division promotes bladder contraction.
- Stimulation of the sympathetic division increases heart rate.
- Dual innervation describes the simultaneous innervation of most visceral organs by both sympathetic and parasympathetic fibers.
Key Neurotransmitters
- Key neurotransmitters include norepinephrine and epinephrine (sympathetic) and acetylcholine (parasympathetic).
- Muscarinic receptors play a role in parasympathetic responses.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge with these flashcards on Chapter 7 of Physiology. Cover key concepts of the autonomic nervous system, including neurotransmitter roles and receptor types. Perfect for students looking to reinforce their learning.
