- published: 02 Apr 2010
- views: 75659762
The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes. The heart is located in the middle compartment of the mediastinum in the chest.
In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles. Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. Fish in contrast have two chambers, an atrium and a ventricle, while reptiles have three chambers. In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
Broadcasting is the distribution of audio and/or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model. Broadcasting began with AM radio broadcasting which came into popular use starting with the invention of the crystal detector in 1906. Before this, all forms of electronic communication, radio, telephone, and telegraph, were "one-to-one", with the message intended for a single recipient. The term "broadcasting", borrowed from the agricultural method of sowing seeds in a field by casting them broadly about, was coined by either KDKA manager Frank Conrad or RCA historian George Clark around 1920 to distinguish this new activity of "one-to-many" communication; a single radio station transmitting to multiple listeners.
Over the air Broadcasting is usually associated with radio and television, though in practice radio and television transmissions take place using both wires and radio waves. The receiving parties may include the general public or a relatively small subset; the point is that anyone with the appropriate receiving technology can receive the signal. The field of broadcasting includes a wide range of practices, from relatively private exchanges such as public radio, community radio and commercial radio, public television, and commercial television.
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in troubled times
it's hard to get straight answers
between the lines
that border wrong or right
the homeland cries
it struggles with confusion
but this feelin' still remains
like shelter from the rain
we live of faith
in the hands of those who guide us
and tear the page
on the fear we left behind
we set the pace
for every born survivor
don't turn the other way
when i need to hear you say
allies with our backs against the wall
i will answer when you call
and take on the odds
for what we believe is true
allies in a world of too much choice
i only need your voice
to tell me you care
i'll be anywhere for you, allies
we search our hearts
to justify the reason
and draw the line
to meet somewhere halfway
if faith is blind
through darkness it will guide us
'cause the spirit still remains
with the keepers of the flame
allies with our backs against the wall
i will answer when you call
and take on the odds
for what we believe is true
in a world of too much choice
i only need your voice
to tell me you care
i'll be anywhere for you, allies
allies with our backs against the wall
i will answer when you call
and take on the odds
for what we believe is true
allies in a world of too much choice
i only need your voice
to tell me you care