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Heart - Coggle Diagram
Heart
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Valves
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AV
VALVES
atrioventricular valves
- tricuspid - RHS
- bicuspid - LHS
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STRUCTURE -
- anchored in papillary muscle
embedded in ventricle wall
- chordae tendinae (valve tendons)
link muscle to valve - ROLES -
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ROLE of CHORDAE TENDINAE-
- ensures that when ventricles
contract, AV valves do not
inside out
SEMILUNAR
VALVES
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when blood leaving V, pushed
flat against artery walls + do not
impede flow
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Cardiac
Cycle
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STAGE 1
DIASTOLE
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- atrial walls relaxed
blood enters atria from vena cava +
pulmonary vein
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- ventricular walls
also relaxed
- SL valves CLOSED preventing
reflux blood arteries to vent
- pres ARTERIES > pres VENT
- blood enters vent
from relaxed atria
STAGE 2
ATRIAL SYSTOLE
- atrial walls contract
forcing more blood into vent
- blood continues enter atria
from vena cava + pulm vein
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- ventricles remain relaxed
- vent volume continues
to increase as fill with blood
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Electrocardiogram
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- metal electrodes placed on external
surface of body (legs/arms/chest)
- minute signals obtained are amplified + recorded
- P wave - contraction of atria
- QRS - excitation of ventricles
- T wave - recovery of ventricles
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