PE - heart and blood vessels Flashcards
1
Q
arteries
A
- contains high concentration of oxygen
- carries oxygenated blood away from heart
- muscular walls that adjust their diameter to increase / decrease blood flow
2
Q
vasoconstriction
A
contract or make smaller to decrease blood flow
3
Q
vasodilation
A
increase diameter and increase blood flow
4
Q
vein
A
- carry dark red deoxygenated blood towards the heart
- contain low concentration of oxygen
- no pulse
- thin walls
- large lumen
- have valves so there is no backflow
5
Q
capillaries
A
- microscopic blood vessels
- huge network of vessels
- links s arteries and veins
- very narrow
- one cell thick
- allow gaseous exchange, nutrients and waste to rapidly diffuse
6
Q
pathway of blood - heart
A
superior vena cava => right atrium => right ventricle => pulmonary artery => lungs => left atrium => left ventricle => aorta => rest of the body
7
Q
heart rate
A
- number of times the heart beats per min
8
Q
stroke vol
A
- vol of blood pumped with each contraction
9
Q
cardiac output
A
- vol of blood pumped by each ventricle in the heart per min
- heart rate x stroke vol
10
Q
diastole
A
- phase of the heart beat
- chambers relax allowing heart to fill with blood
11
Q
systole
A
- phase of heart beat
- chambers contract and heart ejects all blood
12
Q
atriums
A
- upper chambers
- collect blood from veins
13
Q
ventricle
A
- lower chambers
- pump blood out thru the arteries
14
Q
right side
A
- takes deoxygenated blood from the veins
- delivers to the lungs for oxygenation
15
Q
left side
A
- oxygenated blood returns to the heart to the left side
- pumped around the body transporting and delivering oxygen and nutrients.
