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Questions and Answers

Which anatomical division of the Nervous System includes the brain and spinal cord?

  • Afferent neurons
  • Efferent neurons
  • Central nervous system (CNS) (correct)
  • Peripheral nervous system

Which division of the Peripheral Nervous System carries signals away from the brain and spinal cord to peripheral tissues?

  • Efferent neurons (correct)
  • Afferent neurons
  • Somatic efferent neurons
  • ANS

What type of neurons provide sensory input to modulate the function of the efferent division through reflex arcs?

  • ANS
  • Efferent neurons
  • Afferent neurons (correct)
  • Somatic efferent neurons

Which functional subdivision of the peripheral nervous system is involved in the voluntary control of skeletal muscles?

<p>Somatic nervous system (D)</p> Signup and view all the answers

Which division of the Autonomic Nervous System regulates vital bodily functions without conscious participation of the mind?

<p>ANS (D)</p> Signup and view all the answers

Which division of the peripheral nervous system includes any nerves that enter or leave the CNS?

<p>Peripheral nervous system (A)</p> Signup and view all the answers

What is the main purpose of the parasympathetic nervous system according to the text?

<p>To innervate specific organs separately (D)</p> Signup and view all the answers

Where do the afferent impulses that provide sensory input to the CNS originate from?

<p>The viscera and autonomically innervated structures (B)</p> Signup and view all the answers

What do integrating centers in the CNS, like the hypothalamus and medulla oblongata, respond to?

<p>Afferent impulses (D)</p> Signup and view all the answers

What happens when there is a fall in blood pressure according to the text?

<p>Pressure-sensitive neurons send more impulses to the brain (A)</p> Signup and view all the answers

What do most of the afferent impulses translate into?

<p>Involuntary reflex responses (A)</p> Signup and view all the answers

Which structures are responsible for sending efferent reflex impulses via the ANS according to the text?

<p>Cardiovascular centers in the brain (C)</p> Signup and view all the answers

Which type of receptors are directly linked to membrane ion channels?

<p>Nicotinic receptors (C)</p> Signup and view all the answers

What is the main role of second messengers in signal transduction?

<p>Translate neurotransmitter binding into a cellular response (B)</p> Signup and view all the answers

Which system includes adenylyl cyclase and the calcium/phosphatidylinositol system as second messengers?

<p>Metabotropic receptor system (A)</p> Signup and view all the answers

What distinguishes ionotropic receptors from metabotropic receptors in terms of signal transduction?

<p>Metabotropic receptors are directly linked to membrane ion channels (B)</p> Signup and view all the answers

Which type of receptors signal their recognition of a bound neurotransmitter by initiating a series of reactions involving second messengers?

<p>Metabotropic receptors (C)</p> Signup and view all the answers

What is the role of G proteins in the signal transduction processes involving metabotropic receptors?

<p>Transmit signals from the receptor to effector proteins (A)</p> Signup and view all the answers

What is the role of the autonomic nervous system (ANS) in response to stimuli that evoke strong feelings?

<p>It modifies activities of the ANS (A)</p> Signup and view all the answers

In dual innervation of organs by the ANS, what does vagal parasympathetic innervation do to the heart rate?

<p>Slows down heart rate (D)</p> Signup and view all the answers

What is the result of increased sympathetic output to the heart and vasculature?

<p>Compensatory rise in blood pressure and heart rate (D)</p> Signup and view all the answers

What is the predominant factor for controlling heart rate despite dual innervation of the heart?

<p>Parasympathetic nervous system (A)</p> Signup and view all the answers

What happens to the activity of a given organ when one system predominates in controlling it?

<p>It is controlled more effectively (D)</p> Signup and view all the answers

What can modify activities of the autonomic nervous system according to the text?

<p>Strong feelings like rage, fear, and pleasure (D)</p> Signup and view all the answers

Which type of receptors in ANS effector cells are classified based on the neurotransmitters or hormones that bind to them?

<p>Adrenergic and cholinergic receptors (C)</p> Signup and view all the answers

Which neurotransmitters bind to adrenergic receptors in effector cells?

<p>Epinephrine and norepinephrine (D)</p> Signup and view all the answers

What type of receptors are directly linked to membrane ion channels and affect ion permeability?

<p>Ionotropic receptors (B)</p> Signup and view all the answers

Which type of receptors mediate the effects of ligands by activating a second messenger system inside the cell?

<p>Metabotropic receptors (D)</p> Signup and view all the answers

What are the two most widely recognized second messengers mentioned in the text?

<p>Adenylyl cyclase system and calcium/phosphatidylinositol system (C)</p> Signup and view all the answers

Which type of neurotransmitter receptors are membrane proteins that affect ion permeability?

<p>Neurotransmitter receptors (A)</p> Signup and view all the answers

What is the primary neurotransmitter released by the adrenal medulla in response to stimulation by acetylcholine?

<p>Epinephrine (A)</p> Signup and view all the answers

Where do the parasympathetic preganglionic fibers synapse in relation to the effector organs?

<p>Near or on the effector organ (B)</p> Signup and view all the answers

Which nerve accounts for the majority of preganglionic parasympathetic fibers?

<p>Cranial nerve X (Vagus) (C)</p> Signup and view all the answers

In the enteric nervous system, which division of the ANS does it represent?

<p>Autonomic Neurons (A)</p> Signup and view all the answers

What distinguishes the length of preganglionic and postganglionic fibers in the parasympathetic system?

<p>Preganglionic fibers are longer, while postganglionic fibers are short. (D)</p> Signup and view all the answers

Where are the cell bodies of the preganglionic neurons located in the autonomic nervous system?

<p>Within the CNS (D)</p> Signup and view all the answers

What is the main function of the autonomic nervous system in relation to the exocrine glands?

<p>Control of glandular secretions (C)</p> Signup and view all the answers

What is the role of ganglia in the autonomic nervous system?

<p>Act as relay stations between preganglionic and postganglionic neurons (B)</p> Signup and view all the answers

Which type of neurons in the autonomic nervous system are generally nonmyelinated and terminate on effector organs?

<p>Postganglionic neurons (C)</p> Signup and view all the answers

In the autonomic nervous system, what do efferent neurons innervate?

<p>Exocrine glands, cardiac muscle, and smooth muscle (A)</p> Signup and view all the answers

What happens when parasympathetic fibers innervating specific organs such as the gut, heart, or eye are activated individually?

<p>They affect the organs separately. (A)</p> Signup and view all the answers

In the context of the Autonomic Nervous System (ANS), what is the role of streams of afferent impulses originating from autonomically innervated structures?

<p>To provide information on the body's current state to the CNS. (D)</p> Signup and view all the answers

What is the main function of reflex arcs in the Autonomic Nervous System according to the text?

<p>To translate afferent impulses into reflex responses involuntarily. (A)</p> Signup and view all the answers

Which structure plays a crucial role in responding to stimuli by sending out efferent reflex impulses via the ANS?

<p>Medulla oblongata. (B)</p> Signup and view all the answers

What is specifically regulated by pressure-sensitive neurons like baroreceptors in the heart, vena cava, aortic arch, and carotid sinuses?

<p>Blood pressure. (A)</p> Signup and view all the answers

Which type of effector organs receive innervation only from the sympathetic system?

<p>Adrenal medulla, kidney, pilomotor muscles, and sweat glands (A)</p> Signup and view all the answers

What is a major difference between the sympathetic and parasympathetic nervous system?

<p>Sympathetic preganglionic fibers synapse with more postganglionic fibers (C)</p> Signup and view all the answers

In the efferent somatic nervous system, how does the motor neuron reach skeletal muscle?

<p>Traveling directly without ganglia (C)</p> Signup and view all the answers

Which division of the nervous system is under voluntary control?

<p>Somatic Nervous System (D)</p> Signup and view all the answers

Why do responses in the somatic division generally occur faster than those in the autonomic nervous system?

<p>Because a single myelinated motor neuron travels directly to skeletal muscle (C)</p> Signup and view all the answers

What limits the amount of branching that can be done by the parasympathetic division?

<p>The close proximity of ganglia to the organs (D)</p> Signup and view all the answers

What enables a fast response by the somatic nervous system?

<p>Myelination of the motor nerves (D)</p> Signup and view all the answers

In the somatic nervous system, how many muscle fibers may one motor neuron innervate?

<p>100 muscle fibers (A)</p> Signup and view all the answers

Which anatomical arrangement leads to the distinct functions of the parasympathetic division?

<p>Ganglia close to organs (C)</p> Signup and view all the answers

What results in the formation of a motor unit in the somatic nervous system?

<p>Highly branched axons (D)</p> Signup and view all the answers

What is the neurotransmitter responsible for transmission at the neuromuscular junction in the somatic nervous system?

<p>Acetylcholine (D)</p> Signup and view all the answers

Which neurotransmitter mediates the transmission of nerve impulses from autonomic postganglionic nerves to effector organs in the sympathetic system?

<p>Norepinephrine (C)</p> Signup and view all the answers

What type of signaling do norepinephrine and epinephrine represent when acting as neurotransmitters?

<p>Adrenergic signaling (B)</p> Signup and view all the answers

What cellular response follows the activation of receptors by chemical signals?

<p>Phosphorylation of intracellular proteins (B)</p> Signup and view all the answers

Which of the following is true regarding acetylcholine's role at the adrenal medulla?

<p>It acts as a hormone (A)</p> Signup and view all the answers

In the autonomic nervous system, where does acetylcholine primarily mediate the transmission of nerve impulses?

<p>From postganglionic nerves to effector organs (A)</p> Signup and view all the answers

What is the term used to describe fibers that release norepinephrine as a neurotransmitter in the sympathetic system?

<p>Adrenergic fibers (C)</p> Signup and view all the answers

Which of the following represents a cellular response triggered by the binding of chemical signals to receptors?

<p>Increased ion channel conductivity (C)</p> Signup and view all the answers

What is the role of acetylcholine in the parasympathetic nervous system's autonomic ganglia?

<p>It mediates impulse transmission across autonomic ganglia. (B)</p> Signup and view all the answers

Which of the following describes the function of epinephrine secreted by the adrenal medulla?

<p>Functions as a chemical messenger in effector organs. (A)</p> Signup and view all the answers

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