Biology 20 flashcards ~10 min

Human Nervous System

The human nervous system is the body's communication and control network, responsible for detecting changes in the internal and external environment, processing information, and coordinating appropriate responses. It enables movement, sensation, memory, learni...

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The human nervous system is the body's communication and control network, responsible for detecting changes in the internal and external environment, processing information, and coordinating appropriate responses. It enables movement, sensation, memory, learning, and the regulation of essential body functions. By transmitting electrical and chemical signals throughout the body, the nervous system helps maintain homeostasis and allows different organs and systems to work together efficiently.

This flashcard deck covers the fundamental concepts of the human nervous system, including the central nervous system (CNS), peripheral nervous system (PNS), neurons, dendrites, axons, the myelin sheath, synapses, neurotransmitters, sensory neurons, motor neurons, interneurons, reflexes, and the functions of the brain and spinal cord. It also introduces the somatic and autonomic nervous systems and explains how nerve impulses enable communication between the brain, spinal cord, muscles, glands, and sensory organs.

Designed for biology students, healthcare learners, and anyone studying human anatomy, these flashcards present key concepts in a concise question-and-answer format that supports active learning, exam preparation, and long-term retention. Whether you are reviewing the basics of neurobiology or preparing for biology assessments, this deck provides an effective way to understand the structure, function, and importance of the human nervous system.

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The nervous system detects stimuli, processes information, and coordinates the body's responses.
The central nervous system (CNS) and the peripheral nervous system (PNS).
The brain and spinal cord.
The peripheral nervous system consists of all nerves outside the brain and spinal cord.
A neuron is a specialized cell that transmits nerve impulses throughout the body.
The cell body, dendrites, and axon.
Dendrites receive signals from other neurons or sensory receptors.
The axon carries nerve impulses away from the cell body.
The myelin sheath insulates the axon and increases the speed of nerve impulse transmission.
A synapse is the junction where one neuron communicates with another neuron or a target cell.
Neurotransmitters are chemical messengers that transmit signals across a synapse.
The brain processes sensory information, controls body functions, and coordinates thoughts, memory, and movement.
The spinal cord transmits signals between the brain and the rest of the body and controls reflexes.
A reflex is a rapid, automatic response to a stimulus without conscious control.
Sensory neurons carry information from sensory receptors to the central nervous system.
Motor neurons transmit signals from the central nervous system to muscles and glands.
Interneurons connect sensory and motor neurons within the central nervous system.
The somatic nervous system controls voluntary movements of skeletal muscles.
The autonomic nervous system regulates involuntary body functions such as heart rate and digestion.
It enables communication between body parts, coordinates responses to stimuli, and helps maintain homeostasis.