What is Nervous Tissue?
Nervous tissue is the communication and control tissue of the body, made up of neurons and supporting glial cells. It generates and transmits electrical signals that coordinate every body function, from reflexes to thought.
Nervous tissue is composed of neurons, which transmit electrical impulses, and neuroglia, which support and protect neurons, enabling rapid communication throughout the body.
- 1↓Dendrite receives signalDendrites pick up chemical signals from neighboring neurons.
- 2↓Cell body integrates inputThe soma processes incoming signals and generates an action potential if threshold is reached.
- 3↓Axon conducts impulseThe electrical signal travels rapidly down the axon, often sped up by the myelin sheath.
- 4↓Axon terminal releases neurotransmittersVesicles release chemical messengers into the synaptic cleft.
- 5Synapse transmits to next neuronNeurotransmitters bind receptors on the next neuron, continuing the signal.
Step-by-step worked examples
A neuron receives a chemical signal from another cell. What structure receives this input first?
Signal reception happens at branch-like extensions of the neuron. These structures are called dendrites. Answer: The dendrite receives the incoming signal.
Which structure speeds up signal conduction along a long axon?
Faster conduction requires insulation that allows signals to jump between gaps. This fatty insulating layer is called the myelin sheath. Answer: Myelin sheath (produced by Schwann cells or oligodendrocytes).
What happens at the synapse when an electrical signal reaches the axon terminal?
Electrical signals cannot cross the gap between neurons directly. The axon terminal releases neurotransmitters into the synaptic cleft. Answer: Neurotransmitters bind receptors on the next neuron, transmitting the signal chemically.
Flashcards
Quick quiz
Q1.Which part of a neuron receives incoming signals?
Q2.What speeds up electrical impulse conduction along an axon?
Q3.What happens at the synapse?
Q4.What is the main function of neuroglia?
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Common mistakes
Thinking neuroglia transmit electrical signals like neurons. — Correct: Neuroglia support and protect neurons; they don't typically generate or propagate action potentials.
Believing signals cross synapses electrically. — Correct: At most synapses, signals cross chemically via neurotransmitters released into the synaptic cleft.
Confusing dendrites and axons. — Correct: Dendrites receive signals toward the cell body; axons carry signals away from it.
Assuming all neurons are myelinated. — Correct: Only some axons are myelinated; unmyelinated axons conduct signals more slowly.
FAQ
What is nervous tissue?
Nervous tissue is a body tissue made of neurons and neuroglia that generates and transmits electrical signals for communication and control.
What are examples of nervous tissue?
Examples include the brain, spinal cord, and peripheral nerves throughout the body.
How does a nerve impulse travel through nervous tissue?
A signal moves from dendrite to cell body to axon, then crosses the synapse via neurotransmitters to the next neuron.
How is nervous tissue different from muscle tissue?
Nervous tissue transmits signals for communication and control, while muscle tissue contracts to produce movement and force.