6 Questions
The nervous system consists of the central nervous system (CNS), which includes the brain and ______ cord, and peripheral nerves.
spinal
The nervous system is a key component of ______ in the human body, responsible for automatic control and reaction to the surroundings.
homeostasis
Receptors in the skin detect stimuli, sending electrical impulses through sensory neurons to the ______.
CNS
At the end of a sensory neuron, a junction called a synapse releases a chemical that triggers an electrical impulse in a relay neuron in the ______.
CNS
The electrical impulse in the relay neuron then triggers an impulse in a motor neuron, which sends an electrical signal to an effector (usually a ______) to bring about a response.
muscle
Reflex arcs are a common example of the nervous system's role in enabling humans to react to their surroundings and coordinate ______.
behavior
Study Notes
- The nervous system is a key component of homeostasis in the human body, responsible for automatic control and reaction to the surroundings.
- The nervous system consists of the central nervous system (CNS), which includes the brain and spinal cord, and peripheral nerves.
- Receptors in the skin detect stimuli, sending electrical impulses through sensory neurons to the CNS.
- At the end of a sensory neuron, a junction called a synapse releases a chemical that triggers an electrical impulse in a relay neuron in the CNS.
- The electrical impulse in the relay neuron then triggers an impulse in a motor neuron, which sends an electrical signal to an effector (usually a muscle) to bring about a response.
- Reflex arcs are a common example of the nervous system's role in enabling humans to react to their surroundings and coordinate behavior.
- In the case of touching a hot object, the stimulus (heat) is detected by a receptor, triggering an electrical impulse that travels to the CNS and then to a motor neuron, causing a muscle contraction (the response) to pull the hand away from the heat.
- Reflexes are automatic and rapid, bypassing the need for conscious decision-making in the brain.
Explore the key components and functions of the human nervous system, including the central and peripheral nervous systems, synapses, and reflex arcs. Learn about the role of the nervous system in enabling automatic reactions to stimuli and coordinating behavior.
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