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What type of cells are primarily responsible for forming myelin sheaths in the central nervous system?

Oligodendrocytes (correct)

Ependymal cells

Astrocytes

Microglia

Which of the following statements about brain tumors is true?

All brain tumors are benign.

Mature neurons commonly form tumors.

Metastasis can lead to the formation of brain tumors. (correct)

Brain tumors rarely arise from glial cells.

What is a major characteristic of gliomas?

They are the result of mature neuronal growth.

They are highly malignant and grow rapidly. (correct)

They are typically slow-growing and benign.

They originate from ependymal cells.

What is the primary composition of the myelin sheath?

20% protein and 80% lipid Signup and view all the answers

Why is it challenging to treat gliomas with chemotherapy?

The blood-brain barrier reduces drug effectiveness. Signup and view all the answers

What is the primary function of the axon in a neuron?

To conduct nerve signals rapidly Signup and view all the answers

What are axon collaterals?

Branches of the axon Signup and view all the answers

Where does the axon originate in the neuron?

From the axon hillock Signup and view all the answers

What is the role of nodes of Ranvier in neuron function?

To facilitate the exchange of ions Signup and view all the answers

How do myelin sheaths affect nerve signal transmission?

They increase the speed of signal transmission. Signup and view all the answers

What type of neurons are responsible for conducting signals from receptors to the central nervous system (CNS)?

Sensory neurons Signup and view all the answers

Which part of the neuron is primarily responsible for receiving signals?

Dendrites Signup and view all the answers

What is the main function of motor (efferent) neurons?

Conduct signals from the CNS to effector organs Signup and view all the answers

Which component of the neuron contains the nucleus and serves as the control center?

Soma Signup and view all the answers

What term is used to describe the region of the neuron where signals are initiated?

Axon hillock Signup and view all the answers

Which structure is involved in insulating the axon and speeding up signal transmission?

Myelin sheath Signup and view all the answers

What is a distinguishing feature of interneurons?

They connect sensory and motor neurons Signup and view all the answers

Which cellular component is absent in the soma, preventing further cell division?

Centrioles Signup and view all the answers

What is the primary function of synaptic knobs?

Connecting with other neurons at synapses Signup and view all the answers

Which structure encloses the axon in the peripheral nervous system?

Myelin sheath Signup and view all the answers

What is the role of the axolemma?

To act as the plasma membrane of the axon Signup and view all the answers

How many axons can a single neuron have?

One Signup and view all the answers

What do the nodes of Ranvier do?

Speed up signal transmission along the axon Signup and view all the answers

What happens at the trigger zone of the axon?

Electrical signals are initiated Signup and view all the answers

What is the axon hillock primarily responsible for?

Integrating incoming signals to initiate action potentials Signup and view all the answers

What is found within the synaptic knobs?

Synaptic vesicles full of neurotransmitters Signup and view all the answers

What is the primary function of oligodendrocytes in the CNS?

Form myelin sheaths Signup and view all the answers

Which type of neuron is characterized by having a single process leading away from the soma?

Unipolar neuron Signup and view all the answers

What role do astrocytes play in the CNS?

Regulate blood flow in the brain Signup and view all the answers

What is the primary function of Schwann cells in the PNS?

Form myelin sheaths Signup and view all the answers

Which type of glial cell is responsible for lining the internal cavities of the brain?

Ependymal cell Signup and view all the answers

Which type of neuron is most commonly found in the brain and spinal cord?

Multipolar neuron Signup and view all the answers

What is a characteristic feature of anaxonic neurons?

They lack true axons. Signup and view all the answers

What is the purpose of the blood-brain barrier created by astrocytes?

To regulate molecular traffic between blood and brain Signup and view all the answers

How do microglia function within the brain?

They serve as the brain's immune defense. Signup and view all the answers

What is the main function of satellite cells in the PNS?

Regulate the chemical environment of neurons Signup and view all the answers

What is the primary method of communication used by the endocrine system?

Chemical messengers (hormones) Signup and view all the answers

Which of the following is not a step carried out by the nervous system?

Secreting hormones into the bloodstream Signup and view all the answers

Which division of the nervous system is responsible for carrying sensory signals from receptors to the CNS?

Sensory (afferent) division Signup and view all the answers

Which part of the peripheral nervous system carries signals to skeletal muscles?

Somatic motor division Signup and view all the answers

What is the main function of the sympathetic division of the autonomic nervous system?

Preparing the body for action Signup and view all the answers

Which division of the peripheral nervous system carries signals from the viscera, such as the heart and lungs?

Visceral sensory division Signup and view all the answers

The central nervous system (CNS) includes:

Brain and spinal cord Signup and view all the answers

What type of response does the parasympathetic division of the autonomic nervous system typically stimulate?

Decreased respiratory rate Signup and view all the answers

What are effectors in the context of the nervous system?

Cells and organs that respond to CNS commands Signup and view all the answers

Which structure is NOT part of the peripheral nervous system?

Brain Signup and view all the answers

Untitled Quiz

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Questions and Answers

What type of cells are primarily responsible for forming myelin sheaths in the central nervous system?

Which of the following statements about brain tumors is true?

What is a major characteristic of gliomas?

What is the primary composition of the myelin sheath?

Why is it challenging to treat gliomas with chemotherapy?

What is the primary function of the axon in a neuron?

What are axon collaterals?

Where does the axon originate in the neuron?

What is the role of nodes of Ranvier in neuron function?

How do myelin sheaths affect nerve signal transmission?

What type of neurons are responsible for conducting signals from receptors to the central nervous system (CNS)?

Which part of the neuron is primarily responsible for receiving signals?

What is the main function of motor (efferent) neurons?

Which component of the neuron contains the nucleus and serves as the control center?

What term is used to describe the region of the neuron where signals are initiated?

Which structure is involved in insulating the axon and speeding up signal transmission?

What is a distinguishing feature of interneurons?

Which cellular component is absent in the soma, preventing further cell division?

What is the primary function of synaptic knobs?

Which structure encloses the axon in the peripheral nervous system?

What is the role of the axolemma?

How many axons can a single neuron have?

What do the nodes of Ranvier do?

What happens at the trigger zone of the axon?

What is the axon hillock primarily responsible for?

What is found within the synaptic knobs?

What is the primary function of oligodendrocytes in the CNS?

Which type of neuron is characterized by having a single process leading away from the soma?

What role do astrocytes play in the CNS?

What is the primary function of Schwann cells in the PNS?

Which type of glial cell is responsible for lining the internal cavities of the brain?

Which type of neuron is most commonly found in the brain and spinal cord?

What is a characteristic feature of anaxonic neurons?

What is the purpose of the blood-brain barrier created by astrocytes?

How do microglia function within the brain?

What is the main function of satellite cells in the PNS?

What is the primary method of communication used by the endocrine system?

Which of the following is not a step carried out by the nervous system?

Which division of the nervous system is responsible for carrying sensory signals from receptors to the CNS?

Which part of the peripheral nervous system carries signals to skeletal muscles?

What is the main function of the sympathetic division of the autonomic nervous system?

Which division of the peripheral nervous system carries signals from the viscera, such as the heart and lungs?

The central nervous system (CNS) includes:

What type of response does the parasympathetic division of the autonomic nervous system typically stimulate?

What are effectors in the context of the nervous system?

Which structure is NOT part of the peripheral nervous system?

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