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SocorroG

Physiology wks7-13

TermDefinition
Action Potential A rapid electrical change across a neuron’s membrane that allows nerve impulses to travel along axons.
Synapse The junction between neurons where neurotransmitters allow signals to pass from one cell to another.
Neurotransmitter Chemical messengers (like ACh, dopamine, serotonin) that transmit signals across synapses.
Peripheral Nervous System (PNS) All nerves outside the CNS; connects the brain and spinal cord to limbs and organs.
Autonomic Nervous System (ANS) Controls involuntary functions (heart rate, digestion, breathing); includes sympathetic and parasympathetic divisions.
Sympathetic Division The “fight-or-flight” system that increases heart rate, dilates pupils, and boosts alertness during stress.
Parasympathetic Division The “rest-and-digest” system that slows the heart rate and promotes digestion and recovery.
Hematocrit The percentage of red blood cells in whole blood; important for oxygen-carrying capacity.
Cardiac Output The amount of blood the heart pumps per minute (stroke volume × heart rate).
Created by: user-1990682
 

 



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