The valves closing in the heart during a heartbeat
2 of 20
What does one beat of the heart cause?
Blood to pump through the pulmonary and systemic circuit
3 of 20
How many pumps does the heart have working in series?
2
4 of 20
What does the right side of the heart do?
Pump deoxygenated blood to the lungs through the pulmonary artery at a blood pressure of 3.2kPa
5 of 20
What does the left side of the heart do?
Pump oxygenated blood into the aorta at about 15.8kPa
6 of 20
The flow of blood through the heart is intermittent because...
It pushes blood into the arteries and then refills with blood from the veins
7 of 20
Which ventricle wall is thicker?
The left ventricle because it contracts to force blood into the aorta at high pressure, as the blood in the systemic circuit meets much more resistance to flow
8 of 20
Which ventricle do the lungs recieve blood from?
The right ventricle
9 of 20
The lungs are very spongy and here the blood vessels allow blood to flow easily for maximum exchange of gases in the alveoli. Here the resistance is...
Less
10 of 20
What is the heart made of?
Cardiac muscle, which is myogenic (contracts of its own accord)
11 of 20
Which wall is the sinoartial node (SAN) (the heart's natural pacemaker) in?
Right atrium
12 of 20
The SAN sends out electrical impulses to start each heartbeat, what can this be recorded on?
An electrocardiogram
13 of 20
Which muscle contracts first as the impulses spread across it?
Atrial muscle
14 of 20
There is a ring of fibrous tissue between the atria and the ventricles that prevents impulses reaching...
The ventricles
15 of 20
What do the impulses reach?
The atrioventricular node (AVN), between the atria and ventricles
16 of 20
The AVN acts like a relay station to...
delay impulses for a short while so the ventricles do not contract too soon
17 of 20
The AVN sends impulses along special, fast conducting muscle cells in the septum called..... to the base of the heart
Purkyne tissue
18 of 20
Muscle at the base of the ventricles contracts first to push the blood upwards into the?
arteries
19 of 20
The relaxion of the ventricles follows ventricle contraction.What determines the hearts natural rhythm?
Sinoatrial node
20 of 20
Other cards in this set
Card 2
Front
What causes the sound of a heartbeat?
Back
The valves closing in the heart during a heartbeat
Card 3
Front
What does one beat of the heart cause?
Back
Card 4
Front
How many pumps does the heart have working in series?
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