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Ch26Heart&Bloodvesse
heart and blood vessels
Question | Answer |
---|---|
what do capilleries do | join veins and arteries |
What is the outer layer of tough inelastic protein called | collagen |
What is the function of Collagen | Prevents the walls from over expansion |
What is Blood pressure | the force the blood exerts against the walls of a blood vessel mainly the arteries |
What is the use of valves | control the direction of blood flow and prevent backflow |
What is the location of the heart | Torax cavity |
What is the heart | an involuntary muscle that is slow to tire |
What is function of the tricuspid valve | prevent backflow from right ventricle to right atrium |
What is the function of Bicuspid valve | prevent backflow from left ventricle to left atrium |
What is the function of semi lunar valves | Prevent backflow into ventricles |
Name the double circulation systems | Pulmonary circuit and Systemic circuit |
Where does the Pulmonary circuit transport blood | Heart-Lungs-Heart |
Where does systemic circuit transport blood | Heart-Body-Heart |
Advantages of double circulation | Keep oxygen rich and oxygen poor blood seperate Ensure blood pressure is high enough to get to all parts of the body |
What is a portal vein and example | A blood pathway that begins and ends in capilleries eg Hepatic portal vein links stomach and intestines to liver |
What is another name for the pacemaker | SA Node/Sino-atrial Node |
Where is the Sino-Atrial Node loacted | On the wall at the top of the right atrium |
Where is the AV Node/Atriaventricular Node located | In the septum between the right atrium and the right ventricle |
What are the factors that increase the heart beat | Exercise, Temperature, emotions eg love or fear , shock |
What are the factors that decrease the heart beat | Sleep,Alcohol, Relaxation |
What is the lub dub sound caused by | Valves being forced shut |
What is a pulse | A pulse is an alternate expansion and contraction of the arteries |
What is the average pulse | 72 beats per minute |
What is the typical blood pressure is a young adult | 120/80 mm of mercury |
What effects the circulatory system | smoking,diet and exercise |
Where do arteries bring blood | Away from the heart |
Where do veins bring blood | To the heart |