Mr Muddle! Read these ... Think of some categories Exchange of materials Contains valves One layer, 1 cell think Endothelium cells surround lumen Carry blood Large lumen Needs action of muscles to keep blood flowing 3 layers; elastic fibres, muscle and endothelium Stretch and recoil Pulse found Smooth muscle contract for vasoconstriction Smooth muscle dilate for vasodilation Read these ... Think of some categories Place the statements in the correct category.

Learning Outcomes Examine the structure of the blood vessels Compare the structures

Cardiovascular System What do you know already? Needed for? Includes .... Controlled by? Affected by?

Evaluate the procedure ..... Sources of error? Effectiveness of the procedure? Improvements of the apparatus?

Improvements .... Future use string rather than paperclips - as paperclips more susceptible to breaking

How do we know this? Look under the microscope and examine the differences

All have a central cavity; LUMEN An endothelium lines the central lumen of each of the different blood vessels http://www.paec.org/biologypartnership/March%2031%20resources.html

Arteries (EME) Arteries have; an outer layer of connective tissue containing elastic fibres a middle layer containing smooth muscle with more elastic fibres. inner endothilium layer.

The elastic walls of the arteries stretch and recoil to accommodate the surge of blood after each contraction of the heart. The smooth muscle can contract or relax causing vasoconstriction or vasodilation to control blood flow.

Veins Veins have an outer layer of connective tissue containing elastic fibres but a much thinner muscular wall than arteries.

Veins Valves prevent the back flow of blood (by eddy currents)

Capillary Capillaries allow exchange of substances with tissues. (more next week)

Capillary Observe your capillary bed! Squeeze you nail (no polish) what happens?

True or False? Carotid vein returns deoxygenated blood from the head to vena cava Renal artery carries blood to the kidneys to be purified Pulmonary vein carries deoxygenated blood from the heart to the lungs Hepatic portal vein carries deoxygenated blood from gut to liver Coronary vein carries oxygenated blood from lungs to the heart Hepatic artery carries deoxygenated blood from the liver to the vena cava

True or False? F jugular T F artery T F pulmonary F vein Carotid vein returns deoxygenated blood from the head to vena cava Renal artery carries blood to the kidneys to be purified Pulmonary vein carries deoxygenated blood from the heart to the lungs Hepatic portal vein carries deoxygenated blood from gut to liver Coronary vein carries oxygenated blood from lungs to the heart Hepatic artery carries deoxygenated blood from the liver to the vena cava F jugular T F artery T F pulmonary F vein