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