Nervous Tissue Characteristics

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What is a characteristic of neurons regarding their lifespan?

They have a short lifespan of a few years

They can live for a few decades

They can live and function for a lifetime (correct)

They die immediately after birth

What is the function of dendrites in neurons?

To provide nutrition to the neuron

To transmit nerve impulses away from the cell body

To conduct impulses towards the cell body (correct)

To provide structural support to the neuron

What is the term for the branches that extend from the axon at more or less right angles?

Neurite extensions

Axon terminals

Dendrite branches

Axon collaterals (correct)

What is essential for the survival of neurons?

Abundant supplies of oxygen and glucose Signup and view all the answers

What is the term for the knob-like structures at the end of axon terminals?

Boutons Signup and view all the answers

How often do axons typically branch?

Occasionally, with few branches Signup and view all the answers

What is the structural link between the PNS and the CNS?

Gray matter of the CNS Signup and view all the answers

What is the site where the stimulus acts in a reflex arc?

Receptor Signup and view all the answers

What is the function of the integration center in a reflex arc?

Processing and integration of signals Signup and view all the answers

What is a nerve in the PNS?

A collection of axons Signup and view all the answers

How many essential components does a reflex arc have?

5 Signup and view all the answers

What type of behaviors do reflex arcs control?

Simple, reflexive behaviors Signup and view all the answers

Which type of neuroglial cell forms myelin sheaths in the central nervous system (CNS)?

Oligodendrocytes Signup and view all the answers

What is the main function of the myelin sheath?

To insulate the axon and increase the speed of impulse conduction Signup and view all the answers

What is the main difference between the central nervous system (CNS) and the peripheral nervous system (PNS) in terms of myelination?

CNS has oligodendrocytes, while PNS has Schwann cells Signup and view all the answers

What is the composition of the myelin sheath?

Lipoprotein and myelin Signup and view all the answers

What is the main function of satellite cells in the peripheral nervous system (PNS)?

To surround neuron cell bodies in the PNS Signup and view all the answers

What is the characteristic of a nerve in the peripheral nervous system (PNS)?

A bundle of both myelinated and unmyelinated axons Signup and view all the answers