Examlex
Symbiotic relationships between species do not change over time.
Menstruation
The monthly shedding of the uterine lining in females, part of the menstrual cycle that prepares the body for pregnancy.
Norepinephrine
A neurotransmitter and hormone involved in the body's fight or flight response, affecting heart rate, blood pressure, and glucose metabolism.
Neurotransmitter
Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.
Hormone
A chemical substance produced in the body that influences physiological activity by being transported in tissue fluids such as blood to stimulate specific cells or tissues into action.
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