Soc 15 The Structure Of The Heart Flashcards
Cardio-respiratory system
The interaction of the heart and lungs too supply oxygen to muscles during excersize
Cardiovasular
To do with the heart,blood and blood vessels together
Vasodilation
when veins swellup or dilate; widening of theinternal diameter (lumen) of theblood vessel toallowincreasedblood flow.
Vasonconstriction
when veins shrink down; narrowing of theinternal diameter (lumen) of theblood vessel to decrease bloodflow
What are 3 functions of the cardiovasular system
Transports oxygen, carbon dioxide and nutrients
It helps clot blood
It controls the body temperature
What is vascular shunting
Your muscles need more blood for movement and so move away from the organs to the muscles. The process is called vascular shunting. Your heart starts to beat fastee and your blood vessels constrict into order to divert the bloodnto the muscles. Your reflexes get faster and your muscles may tense up
Arteries.
Take blood away from heart
Have thick walls and are more elastic than veins as they carry blood which is at a hogher level
The channel it flows through widens to allow more through so it can reach the working muscles
Veins
Carry blood into heart
Much thinner walls carry blood at a lower level
Helps depxygenate blood throw to the heart
Capillaries
Just one cell thick
At one end they carry oxegenated blood which transfers oxygen and nutrients to the muscles
At the other end they carry deoxygenated blood into the veins picking up waste products
Vascular shunting
process that increases blood flow to activeareas during exercise by divertingblood away from inactive areas;achieved by vasodilation andvasoconstriction.
Immune system
the structures and processes in your body that stop disease.
Platelets
Substance involved in blood clotting
Serotonin
hormone that triggers the clotting process.
Erythocryte
Red blood cells
Haemogoblin
a red protein in the blood that transports oxygen.
