Heart
Which chamber of the heart has the thickest muscle wall?
Left ventricle
What is the most important part of the circulatory system?
the heart/pump
Which part of the heart pumps blood to the aorta?
Left ventricle
What is a double circulatory system?
The blood passes through the heart twice on one complete circuit of the body
Which substance is transported by haemoglobin?
Oxygen
What is the function of septum in a heart?
It separates oxygenated blood from deoxygenated blood
State three types of blood vessels in human circulatory system
Artery, vein, capillary
Which type of blood vessel has low pressure, wide lumen, thin outer wall and less muscle fibre?
Veins
What is the function of valves?
Prevent back flow
What is blood made up of?
Which two valves separate the top and the bottom parts of a heart?
Tricuspid valve, bicuspid valve (mitral valve)
What type of circulatory system does fish have?
Single circulatory system
What is the function of coronary arteries?
Supply blood to cardiac muscle.
What is the correct sequence for blood being pumped from the heart to the lungs?
Right atrium-right ventricle-pulmonary artery
What is the process called when some WBCs destroy pathogens by engulfing them?
Phagocytosis
Which heart valves are open and which are closed when blood passes out of the right ventricle towards the lungs?
Tricuspid valve closed, pulmonary valve open
What is a ECG？And what is the function of ECGs?
Monitor the activity of the heart
State three possible causes of CHD
Smoking, diet that is high in saturated fat, no exercises
Where does haemoglobin become oxyhaemoglobin?
Lungs
How does blood clotting happen?
Platelets release substance to cause soluble fibrinogen become insoluble fibrin, and thus traps more platelets to form a clot.