Blood Vessels And Vascular Shunting Flashcards
(10 cards)
Why is it when exercising muscles that are working need more blood?
- Red blood cells containing O2 move there.
Why? - A source of energy.
What happens to the areas that need more blood?
The blood redistributes away from the inactive areas (digestive system) to active areas (working muscles), the blood pressure increases.
When inactive what occurs?
Vasoconstriction occurs which is when blood vessels constrict to decrease blood flow and supply.
When active when it occurs?
Vasodilation occurs when the blood vessels dilate (widen) to increase blood flow & supply. More blood = more O2.
Describe how arteries, veins & capillaries carry blood.
- They carry blood under pressure.
- The pressure comes from your heart.
- Very important not to be too low or too high.
What is it called when the heart contracts?
Systolic
What is is called when your heart relaxes?
Diastolic.
Describe the blood vessels, Capillaries. How are they important in sport?
- They are the link between arteries & veins - move the blood between the 2.
- Very small.
- They are very important as allow gaseous exchange to occur. O2 in CO2 out.
Describe the blood vessels, arteries. What is there importance in sport?
- Carry the blood away from the heart (under pressure)high), oxygenated blood except pulmonary artery.
- Thick muscular wall.
- Lumen: cavity visible containing blood.
- Small.
- HR increases, muscles need more O2 —> energy.
- Blood flow has to increase.
- Walls of arteries contract and relax to help regulate blood pressure, lumen widens, increased blood flow and vascular shunt.
Describe the blood vessels, veins? What is the importance in sport?
- Carry blood towards the heart (under pressure)low) have valves to stop back flow.
- Blood usually deoxygenated except the pulmonary veins!
- Thinner walls.
- Larger then an artery.
- Lumen visible.
- They ‘re-cycle’ blood bring deoxygenated blood back to heart —> lungs.
