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Which of the following describes dendrites?
Short and branched
Long and branched
Short and unbranched
Long and unbranched
Short and branched
Dendrites are thin, short, and highly branched extensions of the nerve cell body (soma). Their primary biological function is to receive electrical signals from other neurons and convey them towards the cell body.
Dendrites are thin, short, and highly branched extensions of the nerve cell body (soma). Their primary biological function is to receive electrical signals from other neurons and convey them towards the cell body.
Dendrites act like a tree's root system or a wide-area antenna array that collects signals from many different directions simultaneously to feed a central processing unit.
Dendrites = 'D' for 'Discover/Determine' incoming signals.
The neuron structure consists of a cell body, an axon, and dendrites. Dendrites are designed with a high surface area-to-volume ratio due to their extensive branching. This morphology allows the neuron to integrate a vast number of synaptic inputs simultaneously. When a neurotransmitter binds to receptors on the dendrite, it triggers localized graded potentials which propagate towards the axon hillock.
Dendrites serve as the primary input region of the neuron.
Their branching structure is often called a 'dendritic tree'.
They contain specialized structures called dendritic spines that increase the contact area for synaptic transmission.
They are generally much shorter than axons.
Increases receptive surface area for receiving signals.
Allows for complex signal integration from thousands of synapses.
Signal processing in the Central Nervous System (CNS).
Facilitating complex neural network communication.
Axons, by contrast, are typically long and single (though they may branch at their terminals) and are responsible for sending signals away from the cell body.
Option B (Long and branched) is incorrect as dendrites are inherently short; axons are the long extensions.
Option C and D are incorrect as dendrites are characterized by their extensive branching to maximize synaptic connectivity.
A is correct тАФ Dendrites are specialized neuronal projections that are typically short and highly branched to optimize the reception of synaptic inputs.
In competitive exams, remember the mnemonic 'Dendrites-In, Axon-Out' to quickly distinguish between these two fundamental neuronal processes.
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