1:38:07
[Climactic instrumental music]
1:38:16
[Muffled screaming]
1:38:27
[Bell tolling]
1:38:54
MAN'S VOICE: Dr. Gull?
1:38:57
Yes.
1:38:59
MAN'S VOICE:
You were describing the human heart.
1:39:03
Yes.
1:39:07
Yes.
1:39:09
The human heart...
1:39:12
...is a dense and powerful muscle...
1:39:16
...much like the organic equivalent
of mahogany...
1:39:20
...and notoriously difficult to burn.
1:39:28
It's about the size of a fist.
1:39:32
It provides the motor power
for the circulatory system.
1:39:37
The heart contains two atria,
two ventricles and four valves.
1:39:43
SIR WILLIAM:
It is, in effect, a single pump...
1:39:47
...powering a double circuit.
1:39:52
In the adult, the heart rate averages
70 to 80 beats a minute.
1:39:59
Such is the force of the heart beat...