B3 THE CIRCULATORY SYSTEM

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  • Created by: Delice
  • Created on: 09-03-17 21:05
What are the 4 components in blood
platelates , plasma , white blood cells ,red blood cells
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what are platelates and what do they do
they are bits of broken cells. Platelates clump together when a blood vessel becomes damaged in order to produce a clot
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what does plasma do
It transports several substances around the body including foods like glucose , water , hormones , antibodies , and waste products
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what do white blood cells do
they protect the body againsts desease
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what is the function of red blood cells
they transport oxygen from the lungs to the tissues
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why are red blood cells small and flexible
so they can pass through narrow vessels
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why dont red blood cells have a nucleus
so they can be packed with haemoglobin
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how are red blood cells adapted to their function
1) they are small and flexible , so they can pass through narrow blood vessels 2) dont have a nucleas , so they can be packed with haemoglobin
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why are red blood cells small sized with a biconcave sape?
it gives them a large surface area to volume ratio for absorbing oxygen
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what happens when red blood cells reach the lungs
oxygen diffuses from the lungs into the blood
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how is oxyhymoglobin formed
when haemoglobin molecules in the red blood cells bind with the oxygen
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give the word equation for the formation of oxyhaemoglobin
haemoglobin + oxygen --> oxyhaemolobin
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what happens after the formation of oxyhaemoglobin
The blood is pumped around the body to the tissues , where the reverse reaction takes place. Oxygen is released which diffuses into cells
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how does the blood move around the body
in arteries , veins and cappillaries
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what is the function of arteries
They transport blood away from the heart
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what is the function of veins
They transport blood towards the heart
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what does the heart do
it pumps blood around the body
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what is the function of capillaries
they exchange materials with tissies
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what does the right hand side of the heart do
it pumps blood which is low in oxygen to the lungs and back
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what does the left hand side of the heart do
it pumps blood which is rich in oxygen to the rest of the body and back
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true or false , blood pumped to the veins is under much higher pressure than blood pumped into the arteries
False . Blood pumped into the artaries is under much higher pressure than the blood in the veins
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what does a double circulatory system mean and give an example of organisms that have it
Double circulatory system consists of two loops in organisms e.g mammles
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give the pros of having a double circulatory system
blood is pumped to the body at a higher pressure than it is pumped to the lungs. This provides a much greater rate of flow to the body tissues
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how are arteries adapted to their function
they have to cope with a high pressure of blood so they have a thick wall made of elastic muscle fibres
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how are veins adapted to their function
they have a lumen which is much bigger compared to the thickness of the walls . They have valves to prevent the backflow of blood
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how are cappilaries adapted to their function
They are the only blood vessels that have thin permeable walls , to allow the exchange of substances between cells and blood
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what are the 4 main chambers of the heart
left & right ventricles , left & right atria
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what is the wall of the heart made of
muscle
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what do ventricles do
They contract blood out of the heart .
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where does the right ventricle pump blood
It pumps blood a short distance to the lungs . It only pumps blood to the lungs and back
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where does the left ventricle pump blood
it pumps blood around the whole body
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why is the left ventricle more muscular
because it pumps blood under a higher pressure around the whole body
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what do atria do
They receive blood coming back to the heart through the veins
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what do the valves do
They make sure that the blood flows in the right direction
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what are the types of valves
Semilunar , tricuspid and bicuspid
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Why do some white blood cells have a flexible shape
it allows them to engulf disease-causing microorganisms
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Other cards in this set

Card 2

Front

what are platelates and what do they do

Back

they are bits of broken cells. Platelates clump together when a blood vessel becomes damaged in order to produce a clot

Card 3

Front

what does plasma do

Back

Preview of the front of card 3

Card 4

Front

what do white blood cells do

Back

Preview of the front of card 4

Card 5

Front

what is the function of red blood cells

Back

Preview of the front of card 5
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