Examlex
Skeletal muscle action and respiratory movements create pressure gradients that facilitate flow of blood in the veins.
Specialized Cells
Cells differentiated to perform specific functions in an organism, such as muscle cells for movement.
Receptors
Specialized cells or protein molecules in the body that receive and respond to chemical signals, such as neurotransmitters or hormones.
Energy
The capacity to do work or produce change, existing in various forms such as kinetic, potential, thermal, and others.
Electromagnetic Spectrum
The range of all types of electromagnetic radiation, from gamma rays to radio waves, including visible light.
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