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345276
The Heart
Descripción
Biology Mapa Mental sobre The Heart, creado por waitelisa739 el 10/11/2013.
Sin etiquetas
biology
biology
Mapa Mental por
waitelisa739
, actualizado hace más de 1 año
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Creado por
waitelisa739
hace más de 10 años
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Resumen del Recurso
The Heart
Heart Disease
Atheroma
A region of plaque in the lining of the CA can lead to (T), (M) + A)
Thrombosis (T)
blood clot
CHD biggest killer in the UK
Aneurysm (A)
Balloon shape in the Coronary Artiery
myocardial infaction (M)
Interputed blood flow
heart attack
Risk Factors
Smoking
Carbon monoxide
Combines with haemoglobin
reduces amount of blood transported
Nicotine
Blood Cholestral
LDL's
Mainly triglycerides + cholesterol
too much will be deposited in damaged coronary arteries
Leads to a plaque
HDL's
High Energy
Reduces plaque
builds cell membranes
High Blood pressure
Could be a blockage
diet
high saturated fat levels
high salt levels
Structure
Coronary arteries and veins
Provides the heart with blood
Atrium
Ventricles
Thick muscle than atria as pumps blood longer distance
Atrio-ventricular valves
Stops blood from flowing back
Aorta
Carries oxygenated blood to the rest of the body -thick and stretchy and links to the LV
Vena Cava
carries deoxygenated blood to the heart and links to RA
Pulmonary vein and artery
PA carries deoxygenated blood to the lungs to be oxygenated, PV carries oxygenated blood to the heart
Cords
to stop the valves folding the wrong way
Semi lunar valves
stops the blood flowing back
Cardiac cycle
Diastole
relaxed
Sistole
contract
1) SAN cells in top right atrium sends electrical signal for the atria to contract
2)non conductive layer of tissue stops the transition to the ventricles but it hits the AVN
3) when it hits it trigger the AVN cells to produce another electrical signal
4) down the bundle of His causing the ventricles to contract
Pressure
LV has high presssure needed to pump blood a long distance
Cardiac output
Cardiac output = heart rate x stroke volume
The volume of blood pumped by one ventricle in one minute
HR = number of beats per minute
SV = the volume of blood pumped each heart beat
increases with exercise (cardiac output)
Recursos multimedia adjuntos
aneurysm-rupture (image/jpg)
cardiaccycle.gif (image/gif)
Heart_iStock_pic (image/jpg)
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