Adaptations for transport in animals…1
Open Blood is pumped into a haemocoel where it bathes
organs and returns slowly to the heart with little
control over direction of flow. Blood is not contained in
blood vessels.
Closed Blood is pumped into a series of vessels; blood flow is
rapid and direction is controlled. Organs are not bathed
by blood but by tissue fluid that leaks from capillaries.
Single Blood passes through the heart once in each
circulation.
Double Blood passes through the heart twice in each
circulation – once in the pulmonary (lung) circulation
and then again through the systemic (body) circulation.
Types of circulatory systems Comparison of circulatory systems
Circulatory systems may have: • transport medium • a system of vessels • a pump • valves • a respiratory pigment to carry oxygen.
Insects Earthworms Fish Mammals
Open circulatory system. Closed circulatory. Closed, single circulatory Closed
system. Blood pumped to system. heart. Respiratory pigment and oxygenat
pigment in haemoglobin carries continues around body delivers oxygen quick
means a lower Lower pressure to lungs
pressure and
gases in blood due to tracheal gas exchange gases in blood.
forcing tissue fluid into and system. reducing efficiency of alveoli.
Right ventricle – thinner comparatively thicker muscular wall compared t
The mammalian heart push pressure is produced on oxygenated blood rapidly contraction. This preve
ventricle after it Inferior vena cava Apex contracts.
Septum – wall dividing oxyge
Aorta – carries oxygenated
Open Blood is pumped into a haemocoel where it bathes
organs and returns slowly to the heart with little
control over direction of flow. Blood is not contained in
blood vessels.
Closed Blood is pumped into a series of vessels; blood flow is
rapid and direction is controlled. Organs are not bathed
by blood but by tissue fluid that leaks from capillaries.
Single Blood passes through the heart once in each
circulation.
Double Blood passes through the heart twice in each
circulation – once in the pulmonary (lung) circulation
and then again through the systemic (body) circulation.
Types of circulatory systems Comparison of circulatory systems
Circulatory systems may have: • transport medium • a system of vessels • a pump • valves • a respiratory pigment to carry oxygen.
Insects Earthworms Fish Mammals
Open circulatory system. Closed circulatory. Closed, single circulatory Closed
system. Blood pumped to system. heart. Respiratory pigment and oxygenat
pigment in haemoglobin carries continues around body delivers oxygen quick
means a lower Lower pressure to lungs
pressure and
gases in blood due to tracheal gas exchange gases in blood.
forcing tissue fluid into and system. reducing efficiency of alveoli.
Right ventricle – thinner comparatively thicker muscular wall compared t
The mammalian heart push pressure is produced on oxygenated blood rapidly contraction. This preve
ventricle after it Inferior vena cava Apex contracts.
Septum – wall dividing oxyge
Aorta – carries oxygenated
