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Cardiovascular diseases
Open circulatory system:
It's when unicellular organisms move substances like sugar, waste products and etc.....
It's when the blood circulates in large,
open spaces.
A simple heart pumps the blood into
cavities surrounding the organs. When
the heart muscle relaxes the blood is
drawn from the cavity back into the heart,
through a small valued opening.
Closed circulatory system:
It can be single or double circulation.
Fishes have single circulatory.…read more

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Double circulation
The Blood
3…read more

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What are the component parts of the blood?
1. Plasma
2. White Blood Cells
3. Platelets
4. Red Blood Cells
Erythrocytes ­ RBC's
Leucocytes ­ WBC's
Plasma ­
Platelets ­ These clot the blood.
The role of the RBC's is to transport O2 from lungs to the respiring cell. And remove CO2 from
respiring cells to the lungs.…read more

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Red Blood Cells: Biconcave so more hemoglobin can come in: No nucleus so more space for
Properties of water that make it a good transport medium:
Many chemicals dissolve in water. The specific heat capacity for water is really high. It's a
polar molecule so chemicals attract to it.…read more

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The middle layer is made of muscles and elastic tissue.
The outer layer is of connective tissue with collagen fibers.
The vessels serving the lungs are pulmonary circulation.
The vessels serving the body are systematic circulation.…read more

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Systole: Contracting, Diastole: Relaxing
Blood return to the heart from the upper and lower part of the body through the
superior and inferior vena cava to the RA. Contraction of the RA forces the blood
into the RV. This is followed by the contraction of the RV which pumps the blood
into the pulmonary artery sending it to the blood vessels of the lungs.
1. Atrial Systole
Blood returns to the heart through the pulmonary veins from the lungs.…read more

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Blood pressure and its movement
Name the different parts of the heart and draw in the flow of blood.
Blood pressure
What is the name of eth device that measures the blood pressure? Describe how
it works.
A sphygmomanometer is used to measure blood pressure. An inflatable cuff is
wrapped around the upper arm and the gauge measure the pressure.…read more

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flow of blood can be heard by a stethoscope on the artery below the cuff.…read more

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What is the unit? How is it recorded?
It's recorded as two numbers: Systolic/ Diastolic, and it's measured in mmHg.
Normal is 120/
Experiment the heart rate
Aim: To measure the heart rate of Daphnia when giving it different concentrations
of caffeine.
Introduction: The outer part of the Daphnia is transparent, so that we can see
through to the internal organs.…read more


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