Examlex
The two allotropic forms of phosphorus are ________ and ________.
Norepinephrine
A neurotransmitter and hormone involved in the body's response to stress, increasing heart rate and blood flow to muscles.
Heart Rate
The number of times a person's heart beats per minute, indicating cardiovascular health and activity levels.
Synaptic Vesicle
Membranous compartment that encloses a fixed number (called a quantum) of neurotransmitter molecules.
Neurotransmitters
Chemicals in the brain that act as messengers, transmitting signals from one neuron to another across synapses.
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