Download Unit2-KA6aNotesDone

Transport System in mammals
1- Blood and blood vessels
2- Heart and the circulation of blood in the body
3- Lungs and gas exchange
4- Transport in the digestive system
Unit2 – Key area 6: Notes for animal transport- Copy what is in bold and follow
instructions, answering questions in full sentences.
KA6- (MO6-7-8) Animal transport and exchange systems
1/ Mammalian circulatory system
Read the introduction p120
Why do mammals need a circulatory system?
Mammals have a small surface area relative to its volume.
As a result, diffusion cannot be fast enough to ensure the rapid transport of
essential material and a circulatory system is needed.
a/ Blood
What is transported in the blood? P120
Nutrients, oxygen, carbon dioxide and hormones are
transported in the blood.
blood _____
cells (e.g. ____
red and ______
white
The blood is made of ______
blood cells) and a liquid called _____________.
plasma
biconcave
Red blood cells are specialised by being _____________in
nucleus
shape, having no __________and
containing
haemoglobin
_______________.
oxygen
This allows them to transport _____________
efficiently in
oxy
the form of ____haemoglobin.
lungs
Haemoglobin
oxyhaemoglobin
oxygen
tissues
Dull red
Bright red
b/ Blood vessels
- thick, muscular walls
- a narrow central channel
- carry blood under high
pressure away from the heart.
Capillaries form networks at
organs and tissues, are thin
walled and have a large
surface area, allowing
exchange of materials.
- have thinner walls than arteries
- wide channel
- carry blood under low pressure
- Veins contain valves to prevent
backflow of blood and carry blood
towards the heart.
Good video on the heart and circulatory system, for N5, watch from the
start to time= 1mm 30s and then from time= 2min 10s to 2min26s
https://www.youtube.com/watch?v=oHMmtq
Kgs50
Good video on the heart and circulatory system, for N5, watch from the
start to and then from time= 2min 10s to 2min26s
https://www.youtube.com/watch?v=ABTvNR5
9K5Q
Pulmonary
artery2
Vena cava
1
Aorta
3
Pulmonary
4
vein
Right atrium1
Right ventricle2
3 atrium
Left
4Left ventricle
- What are the coronary arteries?
- Why is the muscle of the left
ventricle thicker than that of the
right ventricle?
- What is the function of valves?