blood flow ppt

Emptying the Heart
To Lungs (Pulmonary Artery)
To Body & Head (Aorta)
Atrio-Ventricular valves are… CLOSED Blood from the Ventricles cannot flow back into the Atria
The Heart
Right Atrium
Pocket Valve Left Atrium
Atrio-Ventricular Valve
Tendons Right Ventricle
Left Ventricle
Septum
Helpful Hints
Homer’s Right Hand
Diagrams of the heart usually show the heart as if you were looking at it in someone else’s chest Homer’s Left Hand
Walls of the heart are made of … … muscle
The walls of the left ventricle are much thicker than the walls of the right ventricle because … …the left ventricle has to pump blood much further.
In the Lungs
Cell is packed with … …haemoglobin
Haemoglobin + Oxygen
In the BodyTissues
Oxyhaemoglobin
Right Side of Homer’s Heart
Left Side of Homer’s Heart
The plural of atrium is… atria … because atrium is a Latin word!
Pulmonary Artery… …to lungs Vena Cava… …from body
White Blood Cells Cell fragments called… …platelets A strawcoloured liquid called… …plasma
Red Blood Cells
Carry oxygen
Fight infections
Help with blood clotting
Capillaries are adapted for … …exchange of materials. Gaps between cells in capillary wall… …allow plasma to leak in and out The capillaries are very narrow. (They are just large enough for a red blood cell to squeeze through) This means that blood in the capillaries moves very… SLOWLY Oxygen, food molecules and hormones diffuse from the blood to the cells
Heaocket valves are… OPEN Blood flows from the Ventricles into the Pulmonary Artery and Aorta
In the lungs, blood loses… carbon dioxide… …and gains… oxygen Head
Wide lumen
Veins also have valves to… …keep blood flowing in the right direction
Valves open to allow blood to flow… …TOWARDS heart
Valves close to stop blood flowing… …AWAY FROM heart
Carries dissolved substances: Carbon dioxide Other wastes Food molecules Hormones
Red Blood Cells are adapted for carrying oxygen Shape: Biconcave disc Dimple on either side of cell increases… … surface area for absorption of oxygen Mature red blood cell has no… nucleus This make s more room for… haemoglobin.
Filling the Heart
Left atrium fills with blood from… Right atrium fills with blood from… …the body (Vena Cava) Heart muscle is… RELAXED Pocket valves are… CLOSED Atrio-Ventricular valves are… OPEN Blood flows from the atria into the ventricles Blood cannot flow back from the Pulmonary Artery and Aorta into the Ventricles … the lungs (Pulmonary Vein)
Veins carry blood back to the heart Blood is carried away from heart by… … arteries Blood Pressure DECREASES as it flows round system
Capillaries join to form… … veins
Thick layer of muscle and elastic fibres
Veins are adapted to deal with blood under LOW pressure
Thinner outer wall than arteries Thinner layer of muscle and elastic fibres than arteries
Aorta… …to body
Pulmonary Vein… …from lungs
The right side of the heart carries… …deoxygenated blood. The left side of the heart carries… …oxygenated blood.
Arteries divide to form… … capillaries
Arteries are adapted to deal with blood under HIGH pressure
Narrow lumen (space through which blood flows)
Thick outer wall
Deoxygenated Blood
Lungs
Oxygenated Blood
Pulmonary Circulation
Heart
Systemic Circulation Body
In the tissues of the body, blood loses… oxygen …and gains… carbon dioxide…
Wall of capillary is very thin… …only one cell thick Carbon dioxide and other wastes diffuse from the cells to the blood
Cells in Body Tissues
The Blood is made up of four components…