The Star P Cygni (In the Constellation Cygnus, the Swan)

question 219

Multiple Choice

The star P Cygni (in the constellation Cygnus, the Swan) is surrounded by an extensive low-density atmosphere. It has a bright, continuous spectrum with many narrow, dark absorption lines and a few bright emission lines. The bright, continuous part of the spectrum is produced by

• A) only the part of the low-density atmosphere that is between Earth and the surface of the star.
• B) the low-density atmosphere of the star emitting light in all directions.
• C) all parts of the star, the stellar surface, and the atmosphere, equally.
• D) the hot, dense, opaque gas of the star's surface.

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Definitions:

Neuron

A specialized cell transmitting nerve impulses; a nerve cell.

Synaptic Vesicle

a small, spherical sac containing neurotransmitters, found in the nerve endings, crucial for transmitting signals between neurons.

Myelin

A fatty substance that surrounds neurons' axons, facilitating faster transmission of electrical signals.

Receptor Site

A receptor site is a specific location on a cell surface where certain molecules, such as hormones or neurotransmitters, bind to trigger a change in the cell's function or activity.