Page 97 - (DK) I Can’t Believe It! 2

IT CAN’T BE TRUE! 95

FAST FACTS
Pints
The amount of Liters per min
per min
blood pumped
by the heart in a
minute is known 50 Top cyclist (male) 100
as “cardiac Cross-country Women Men Pregnant
output.” This skier (male) 9½ pints 10½ pints women
can be used 40 80 (4.5 liters) (5 liters) 13¾ pints
to measure a Fit amateur (6.5 liters)
person’s level 30 cyclist On average, women
of fitness. The 60 have slightly less blood
more blood Exercising than men. An average
pumped, the 20 untrained 40 pregnant woman, however,
more work their person has more blood than a
bodies can do. man. This extra blood is
10 Resting untrained 20 used to carry nutrients
person
and oxygen to her baby.
0 0

The heart has a left and
a right side. The right
Blood travels from the An adult side delivers blood to
heart to the lungs to heart pumps the lungs to pick up
collect oxygen through a enough blood oxygen. The left side
large blood vessel called to fill 5.3 10,000- pumps this oxygen-rich
the pulmonary artery. blood around the body
gallon (38,000-liter) to deliver nutrients to
road tankers all the body’s cells. The
every month. cells absorb the oxygen,
and the oxygen-poor
The heart pumps oxygen-rich blood to blood returns to the
the body through arteries (shown in red). heart to start its
This blood is bright red because it contains journey again.
hemoglobin, the substance that carries the
oxygen. Oxygen-poor blood is dark red.

US_094_095_309600_ICBT_Heart.indd 95 19/12/17 12:56 pm