Examlex
Isaac Newton was the first person to offer an explanation of light as being in the form of waves.
Cell Membranes
The semipermeable membrane surrounding the cytoplasm of a cell, which regulates the passage of substances in and out of the cell.
Adrenal Glands
Endocrine glands located above the kidneys that produce a variety of hormones including adrenaline and cortisol.
Epinephrine
A hormone also known as adrenaline that is secreted by the adrenal glands and increases heart rate, muscle strength, blood pressure, and sugar metabolism.
Norepinephrine
A neurotransmitter involved in arousal and the stress response, also acting as a hormone.
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