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Gateway Science
Module B1
Understanding Ourselves
Mr P.Schofield…read more

Slide 2

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B1a Fit for life
· Each of the life processes needs ENERGY.
Respiration is the process our bodies use to
produce this energy:
· Glucose + oxygen g water + carbon
dioxide + ENERGY
· The glucose we need comes from food and the
oxygen from breathing. Water and carbon dioxide
are breathed out. The MAIN product of this
equation is energy…read more

Slide 3

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Aerobic Respiration
· Respiration takes place
Breathing takes place
in the lungs.
· During heavy exercise
the rate of breathing
increases in order to
get more oxygen into
the lungs.
· The pulse rate also
increases in order to
get more oxygen to
the muscle cells.…read more

Slide 4

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Anaerobic Respiration
· Unlike aerobic respiration, anaerobic respiration is when
energy is provided WITHOUT needing oxygen.
Glucose g lactic acid + a bit of energy
· This happens when the body can't provide oxygen quick
enough for aerobic respiration to take place.
· Anaerobic respiration produces energy much quicker than
aerobic respiration but only produces 1/20th as much.
· Lactic acid is also produced, and this can build up in muscles
causing fatigue and an oxygen debt.
· This "debt" then needs to be "repaid" by deep breathing to
oxidise the lactic acid.…read more

Slide 5

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Blood Pressure
· The heart is a pump
designed to force blood
through our body. Blood is
pumped from the heart
through the arteries out to
our muscles and organs.
· It pumps the blood under
· Blood pressure is measured
using two numbers. An
example of this could be
'the blood pressure is 120
over 80', which is written
as '120/80mmHg'.…read more

Slide 6

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Systolic and diastolic
· The first figure is the
systolic blood pressure -
the maximum pressure in
the arteries when the
heart contracts (beats) and
pushes blood out into the
· The second figure is the
diastolic blood pressure.
This is the minimum
pressure in the arteries
between beats when the
heart relaxes to fill with
blood.…read more

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