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BTEC UNIT 1 Cardio

Cardiovascular system

Name the structure of capillaries Walls one cell thick narrow large in number
Name the structure of a vein Walls contain thin layer of muscle Return blood to heart Pocket valves Positioned between skeletal muscle Positioned inside thoracic cavity
Name the structures of an artery Thick walls (middle layer of smooth muscle) to with stand high blood pressure. Takes blood away from the heart
What does vasoconstriction mean? Reducing flow of blood into capillaries by action of sympathetic nerves
What does vasodilatation mean? Increasing flow of blood into capillaries
Why does the body redistribute blood? . To ensure that oxygen and nutrients are directed to the tissues needed it and to control temperature
Why does more blood go to the heart, skin, and working muscles during exercise? Heart is a muscles and requires nutrients, working muscles require nutrients, skin requires energy to cool body and also to radiate heat away
What are pre-capillary sphincters? Rings of muscle at the entrance to a capillary bed, which can vasodilate or constrict the arteriole serving that capillary bed
Blood in the vena cave vein is low in which substance? Oxygen
What role do the semi lunar valves have in the heart? They prevent blood from flowing back into the ventricles
Which side of the heart pumps blood to the lungs? Right side
What are the heart chambers called that fill with blood from the vena cava atrium
Why does the left side of the heart have a thicker wall? Because it pumps blood to the body, needs more force
Why are there two sides to the heart It enables two pumps to function separately (to the lungs to collect oxygen and then to the body to deliver the oxygen and take waste products away)
Name the two bottom chambers of the heart Ventricles
Where are the semi lunar valves? The valves that prevent back flow into the heart where the blood leaves to heart into the pulmonary artery and aorta
Name the two valves that separate the atrium from the ventricles Bicuspid and tricuspid or atrioventricular valves
Created by: Tina Dean