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Transcript of Blood
What is in it?
Mostly water, with things dissolved in it:
This is within the red blood cells and it:
White Blood Cells
Defend the body against diease
Kill bacteria using phagocytes and antibodies
Roles of the Blood
2. Red Blood Cells
3. White Blood Cells
Glucose and nutrients
It carries everything else in it.
Red Blood Cells
Carry Oxygen via the
• combines with oxygen and carries it to muscle cells
• picks up carbon dioxide and expires it as cellular waste
• transports carbon dioxide from tissues back to lungs
• regulates iron levels
Made in bone marrow
Made in bone marrow, lymph nodes and spleen.
Stick to each other
Form blood clots (scabs)
Stop you from loosing blood
Stops germs getting in
1. Carries things
2. Protecting against infections
from the lungs to the cells
from cells to lungs
e.g. water to kidneys
and other nutrient from gut to cells
White blood cells
to infected places
to skin to be removed
Blood travels under high pressure
Elastic fibres and muscle cope with high blood pressure
from the heart
Do not have valves
Blood flows more slowly, low pressure.
alves to stop blood flowing backwards
to the heart
Thin walls and large lumen.
Blood travels under very low pressure
Walls are one cell thick for easy diffusion of O2 and Food into cells and CO2 and waste back
Carry blood to all the cells in the body
Heart Rate- The number of times your heart beats per minute.
Resting HR= 70bpm (althetes as low as 40bmp)
Max HR= 220-Age
Stoke Volume (ml)- the volume of blood pumped out of the heart during one contraction
Cardiac Output- Amount of blood ejected from the heart in one minute.
Cardiac Output (CO) = Stroke Volume (SV) x Heart Rate (HR)
One of the functions of blood it to carry heat to where it is needed.
Blood vessels under the skin widen / vasodilate
Blood moves heat to extremities to protect the core temperature
Body hair flattens
Blood vessels under the skin contract / vasoconstrict
Blood moves heat to the core
Body hairs lift to trap air
Body starts to shiver to produce heat
Blood Related Illnesses
Haemophilia- blood cannot clot.
Anaemia- Decrease in RBCs/ Haemoglobin
High Blood Pressure- Blood can't move efficiently
Leukemia- blood cancer
Effects of Performance?
Contact sport- Bruising
Feeling tired and feint
Can't exercise for long periods
Treatment may mean you can't train
Increased production on RBCs and haemoglobin concentration does too.
Volume of blood increase
More capillaries form around the alveoli
What type of athlete good for:
1. Athlete goes to altitude where there is a lack of oxygen
2. Same amount of oxygen needed by the body to train, therefore body has to adapt.
3. Once the body has adapted, they go back to sea level (more O2) and they can take it lots more oxygen
Artery- Capillary- Vein
Vena Cava- Vein
Colour each section to indicate oxygenated or deoxygenated blood. Draw arrows to indicate blood flow.
Double Circulatory System
Pulmonary Circuit- Right- Lungs
Systemic circuit- Left - Body
1. Atria Contract
2. Ventricles Contract
3. Out of the arteries
4. In through the veins
Blood passes through the heart twices in each circuit.
120 ml x 70 bmp = 18 litres/minute
Page 55. Task 1- Find out your resting heart rate.
Page 56- Task 2- How fast can your heart arte recover to resting after exercise?
What does having a low RHR tell us about our cardiovacular fitness?
What does the speed of recover tell us about our cardiovascular fitness?
Page 57- Task 3- Calculating cardiac output.
Effect of exercise
In order to improve our CV fitnes we should work at 55-85% of our Max HR.
What happen to the following after lots of exercise?